MEMO 1
U.S. Department of Justice
Office of the Legal Counsel
September 25, 2001
MEMORANDUM OPINION FOR TIMOTHY FLANIGAN, THE DEPUTY COUNSEL TO THE PRESIDENT
FROM: John C. Yoo, Deputy Assistant Attorney General
THE PRESIDENT'S CONSTITUTIONAL AUTHORITY TO CONDUCT MILITARY OPERATIONS AGAINST TERRORISTS AND NATIONS SUPPORTING THEM
The President has broad constitutional power to take military action in response to the terrorist attacks on the United States on September 11, 2001. Congress has acknowledged this inherent executive power in both the War Powers Resolution and the Joint Resolution passed by Congress on September 14, 2001.
The President has constitutional power not only to retaliate against any person, organization, or State suspected of involvement in terrorist attacks on the United States, but also against foreign States suspected of harboring or supporting such organizations.
The President may deploy military force preemptively against terrorist organizations or the States that harbor or support them, whether or not they can be linked to the specific terrorist incidents of September 11.
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September 25, 2001
MEMORANDUM OPINION FOR THE DEPUTY COUNSEL TO THE PRESIDENT
You have asked for our opinion as to the scope of the President's authority to take military action in response to the terrorist attacks on the United States on September 11, 2001. We conclude that the President has broad constitutional power to use military force. Congress has acknowledged this inherent executive power in both the War Powers Resolution, Pub. L. No. 93-148, 87 Stat. 555 (1973), codified at 50 U.S.C. §§ 1541-1548 (the "WPR"), and in the Joint Resolution passed by Congress on September 14, 2001, Pub. L. No. 107-40, 115 Stat. 224 (2001). Further, the President has the constitutional power not only to retaliate against any person, organization, or State suspected of involvement in terrorist attacks on the United States, but also against foreign States suspected of harboring or supporting such organizations. Finally, the President may deploy military force preemptively against terrorist organizations or the States that harbor or support them, whether or not they can be linked to the specific terrorist incidents of September 11.
Our analysis falls into four parts. First, we examine the Constitution's text and structure. We conclude that the Constitution vests the President with the plenary authority, as Commander in Chief and the sole organ of the Nation in its foreign relations, to use military force abroad - especially in response to grave national emergencies created by sudden, unforeseen attacks on the people and territory of the United States. Second, we confirm that conclusion by reviewing the executive and judicial statements and decisions interpreting the Constitution and the President's powers under it. Third, we analyze the relevant practice of the United States, including recent history, that supports the view that the President has the authority to deploy military force in response to emergency conditions such as those created by the September 11, 2001, terrorist attacks. Finally, we discuss congressional enactments that, in our view, acknowledge the President's plenary authority to use force to respond to the terrorist attack on the United States.
Our review establishes that all three branches of the Federal Government - Congress, the Executive, and the Judiciary - agree that the President has broad authority to use military force abroad, including the ability to deter future attacks.
I.
The President's constitutional power to defend the United States and the lives of its people must be understood in light of the Founders' express intention to create a federal government "cloathed with all the powers requisite to [the] complete execution of its trust." The Federalist No. 23, at 122 (Alexander Hamilton) (Charles R. Kesler ed., 1999). Foremost among the objectives committed to that trust by the Constitution is the security of the Nation. (1) As Hamilton explained in arguing for the Constitution's adoption, because "the circumstances which may affect the public safety are [not] reducible within certain determinate limits, . . . it must be admitted, as a necessary consequence that there can be no limitation of that authority which is to provide for the defense and protection of the community in any matter essential to its efficiency." Id. (2)
"It is 'obvious and unarguable' that no governmental interest is more compelling than the security of the Nation." Haig v. Agee, 453 U.S. 280, 307 (1981) (citation omitted). Within the limits that the Constitution itself imposes, the scope and distribution of the powers to protect national security must be construed to authorize the most efficacious defense of the Nation and its interests in accordance "with the realistic purposes of the entire instrument." Lichter v. United States, 334 U.S. 742, 782 (1948). Nor is the authority to protect national security limited to actions necessary for "victories in the field." Application of Yamashita, 327 U.S. 1, 12 (1946). The authority over national security "carries with it the inherent power to guard against the immediate renewal of the conflict." Id.
We now turn to the more precise question of the President's inherent constitutional powers to use military force.
Constitutional Text. The text, structure and history of the Constitution establish that the Founders entrusted the President with the primary responsibility, and therefore the power, to use military force in situations of emergency. Article II, Section 2 states that the "President shall be Commander in Chief of the Army and Navy of the United States, and of the Militia of the several States, when called into the actual Service of the United States." U.S. Const. art. II, § 2, cl. 1. He is further vested with all of "the executive Power" and the duty to execute the laws. U.S. Const. art. II, § 1. These powers give the President broad constitutional authority to use military force in response to threats to the national security and foreign policy of the United States. (3) During the period leading up to the Constitution's ratification, the power to initiate hostilities and to control the escalation of conflict had been long understood to rest in the hands of the executive branch. (4)
By their terms, these provisions vest full control of the military forces of the United States in the President. The power of the President is at its zenith under the Constitution when the President is directing military operations of the armed forces, because the power of Commander in Chief is assigned solely to the President. It has long been the view of this Office that the Commander-in-Chief Clause is a substantive grant of authority to the President and that the scope of the President's authority to commit the armed forces to combat is very broad. See, e.g., Memorandum for Honorable Charles W. Colson, Special Counsel to the President, from William H. Rehnquist, Assistant Attorney General, Office of Legal Counsel, Re: The President and the War Power: South Vietnam and the Cambodian Sanctuaries (May 22, 1970) (the "Rehnquist Memo"). The President's complete discretion in exercising the Commander-in-Chief power has also been recognized by the courts. In the Prize Cases, 67 U.S. (2 Black) 635, 670 (1862), for example, the Court explained that, whether the President "in fulfilling his duties as Commander in Chief" had met with a situation justifying treating the southern States as belligerents and instituting a blockade, was a question "to be decided by him" and which the Court could not question, but must leave to "the political department of the Government to which this power was entrusted." (5)
Some commentators have read the constitutional text differently. They argue that the vesting of the power to declare war gives Congress the sole authority to decide whether to make war. (6) This view misreads the constitutional text and misunderstands the nature of a declaration of war. Declaring war is not tantamount to making war - indeed, the Constitutional Convention specifically amended the working draft of the Constitution that had given Congress the power to make war. An earlier draft of the Constitution had given to Congress the power to "make" war. When it took up this clause on August 17, 1787, the Convention voted to change the clause from "make" to "declare." 2 The Records of the Federal Convention of 1787, at 318-19 (Max Farrand ed., rev. ed. 1966) (1911). A supporter of the change argued that it would "leav[e] to the Executive the power to repel sudden attacks." Id. at 318. Further, other elements of the Constitution describe "engaging" in war, which demonstrates that the Framers understood making and engaging in war to be broader than simply "declaring" war. See U.S. Const. art. I, § 10, cl. 3 ("No State shall, without the Consent of Congress . . . engage in War, unless actually invaded, or in such imminent Danger as will not admit of delay."). A State constitution at the time of the ratification included provisions that prohibited the governor from "making" war without legislative approval, S.C. Const. art. XXVI (1776), reprinted in 6 The Federal and State Constitutions 3247 (Francis Newton Thorpe ed., 1909). (7) If the Framers had wanted to require congressional consent before the initiation of military hostilities, they knew how to write such provisions.
Finally, the Framing generation well understood that declarations of war were obsolete. Not all forms of hostilities rose to the level of a declared war: during the seventeenth and eighteenth centuries, Great Britain and colonial America waged numerous conflicts against other states without an official declaration of war. (8) As Alexander Hamilton observed during the ratification, "the ceremony of a formal denunciation of war has of late fallen into disuse." The Federalist No. 25, at 133 (Alexander Hamilton). Instead of serving as an authorization to begin hostilities, a declaration of war was only necessary to "perfect" a conflict under international law. A declaration served to fully transform the international legal relationship between two states from one of peace to one of war. See 1 William Blackstone, Commentaries *249-50. Given this context, it is clear that Congress's power to declare war does not constrain the President's independent and plenary constitutional authority over the use of military force.
Constitutional Structure. Our reading of the text is reinforced by analysis of the constitutional structure. First, it is clear that the Constitution secures all federal executive power in the President to ensure a unity in purpose and energy in action. "Decision, activity, secrecy, and dispatch will generally characterize the proceedings of one man in a much more eminent degree than the proceedings of any greater number." The Federalist No. 70, at 392 (Alexander Hamilton). The centralization of authority in the President alone is particularly crucial in matters of national defense, war, and foreign policy, where a unitary executive can evaluate threats, consider policy choices, and mobilize national resources with a speed and energy that is far superior to any other branch. As Hamilton noted, "Energy in the executive is a leading character in the definition of good government. It is essential to the protection of the community against foreign attacks." Id. at 391. This is no less true in war. "Of all the cares or concerns of government, the direction of war most peculiarly demands those qualities which distinguish the exercise of power by a single hand." Id. No. 74, at 415 (Alexander Hamilton). (9)
Second, the Constitution makes clear that the process used for conducting military hostilities is different from other government decisionmaking. In the area of domestic legislation, the Constitution creates a detailed, finely wrought procedure in which Congress plays the central role. In foreign affairs, however, the Constitution does not establish a mandatory, detailed, Congress-driven procedure for taking action. Rather, the Constitution vests the two branches with different powers - the President as Commander in Chief, Congress with control over funding and declaring war - without requiring that they follow a specific process in making war. By establishing this framework, the Framers expected that the process for warmaking would be far more flexible, and capable of quicker, more decisive action, than the legislative process. Thus, the President may use his Commander-in-Chief and executive powers to use military force to protect the Nation, subject to congressional appropriations and control over domestic legislation.
Third, the constitutional structure requires that any ambiguities in the allocation of a power that is executive in nature - such as the power to conduct military hostilities - must be resolved in favor of the executive branch. Article II, section 1 provides that "[t]he executive Power shall be vested in a President of the United States." U.S. Const. art. II, § 1. By contrast, Article I's Vesting Clause gives Congress only the powers "herein granted." Id. art. I, § 1. This difference in language indicates that Congress's legislative powers are limited to the list enumerated in Article I, section 8, while the President's powers include inherent executive powers that are unenumerated in the Constitution. To be sure, Article II lists specifically enumerated powers in addition to the Vesting Clause, and some have argued that this limits the "executive Power" granted in the Vesting Clause to the powers on that list. But the purpose of the enumeration of executive powers in Article II was not to define and cabin the grant in the Vesting Clause. Rather, the Framers unbundled some plenary powers that had traditionally been regarded as "executive," assigning elements of those powers to Congress in Article I, while expressly reserving other elements as enumerated executive powers in Article II. So, for example, the King's traditional power to declare war was given to Congress under Article I, while the Commander-in-Chief authority was expressly reserved to the President in Article II. Further, the Framers altered other plenary powers of the King, such as treaties and appointments, assigning the Senate a share in them in Article II itself. (10) Thus, the enumeration in Article II marks the points at which several traditional executive powers were diluted or reallocated. Any other, unenumerated executive powers, however, were conveyed to the President by the Vesting Clause.
There can be little doubt that the decision to deploy military force is "executive" in nature, and was traditionally so regarded. It calls for action and energy in execution, rather than the deliberate formulation of rules to govern the conduct of private individuals. Moreover, the Framers understood it to be an attribute of the executive. "The direction of war implies the direction of the common strength," wrote Alexander Hamilton, "and the power of directing and employing the common strength forms a usual and essential part in the definition of the executive authority." The Federalist No. 74, at 415 (Alexander Hamilton). As a result, to the extent that the constitutional text does not explicitly allocate the power to initiate military hostilities to a particular branch, the Vesting Clause provides that it remain among the President's unenumerated powers.
Fourth, depriving the President of the power to decide when to use military force would disrupt the basic constitutional framework of foreign relations. From the very beginnings of the Republic, the vesting of the executive, Commander-in-Chief, and treaty powers in the executive branch has been understood to grant the President plenary control over the conduct of foreign relations. As Secretary of State Thomas Jefferson observed during the first Washington Administration: "the constitution has divided the powers of government into three branches [and] has declared that the executive powers shall be vested in the president, submitting only special articles of it to a negative by the senate." Due to this structure, Jefferson continued, "the transaction of business with foreign nations is executive altogether; it belongs, then, to the head of that department, except as to such portions of it as are specially submitted to the senate. Exceptions are to be construed strictly." Thomas Jefferson, Opinion on the Powers of the Senate (1790), reprinted in 5 The Writings of Thomas Jefferson, at 161 (Paul L. Ford ed., 1895). In defending President Washington's authority to issue the Neutrality Proclamation, Alexander Hamilton came to the same interpretation of the President's foreign affairs powers. According to Hamilton, Article II "ought . . . to be considered as intended . . . to specify and regulate the principal articles implied in the definition of Executive Power; leaving the rest to flow from the general grant of that power." Alexander Hamilton, Pacificus No. 1 (1793), reprinted in 15 The Papers of Alexander Hamilton, at 33, 39 (Harold C. Syrett et al. eds., 1969). As future Chief Justice John Marshall famously declared a few years later, "The President is the sole organ of the nation in its external relations, and its sole representative with foreign nations. . . . The [executive] department . . . is entrusted with the whole foreign intercourse of the nation . . . ." 10 Annals of Cong. 613-14 (1800). Given the agreement of Jefferson, Hamilton, and Marshall, it has not been difficult for the executive branch consistently to assert the President's plenary authority in foreign affairs ever since.
In the relatively few occasions where it has addressed foreign affairs, the Supreme Court has agreed with the executive branch's consistent interpretation. Conducting foreign affairs and protecting the national security are, as the Supreme Court has observed, "'central' Presidential domains." Harlow v. Fitzgerald, 457 U.S. 800, 812 n.19 (1982). The President's constitutional primacy flows from both his unique position in the constitutional structure, and from the specific grants of authority in Article II that make the President both the Chief Executive of the Nation and the Commander in Chief. See Nixon v. Fitzgerald, 457 U.S. 731, 749-50 (1982). Due to the President's constitutionally superior position, the Supreme Court has consistently "recognized 'the generally accepted view that foreign policy [is] the province and responsibility of the Executive.'" Department of the Navy v. Egan, 484 U.S. 518, 529 (1988) (quoting Haig v. Agee, 453 U.S. at 293-94). "The Founders in their wisdom made [the President] not only the Commander-in-Chief but also the guiding organ in the conduct of our foreign affairs," possessing "vast powers in relation to the outside world." Ludecke v. Watkins, 335 U.S. 160, 173 (1948). This foreign affairs power is exclusive: it is "the very delicate, plenary and exclusive power of the President as sole organ of the federal government in the field of international relations - a power which does not require as a basis for its exercise an act of Congress." United States v. Curtiss-Wright Export Corp., 299 U.S. 304, 320 (1936).
Conducting military hostilities is a central tool for the exercise of the President's plenary control over the conduct of foreign policy. There can be no doubt that the use of force protects the Nation's security and helps it achieve its foreign policy goals. Construing the Constitution to grant such power to another branch could prevent the President from exercising his core constitutional responsibilities in foreign affairs. Even in the cases in which the Supreme Court has limited executive authority, it has also emphasized that we should not construe legislative prerogatives to prevent the executive branch "from accomplishing its constitutionally assigned functions." Nixon v. Administrator of General Servs., 433 U.S. 425, 443 (1977).
II.
Executive Branch Construction and Practice. The position we take here has long represented the view of the executive branch and of the Department of Justice. Attorney General (later Justice) Robert Jackson formulated the classic statement of the executive branch's understanding of the President's military powers in 1941:
Article II, section 2, of the Constitution provides that the President "shall be Commander in Chief of the Army and Navy of the United States." By virtue of this constitutional office he has supreme command over the land and naval forces of the country and may order them to perform such military duties as, in his opinion, are necessary or appropriate for the defense of the United States. These powers exist in time of peace as well as in time of war.
. . . .
Thus the President's responsibility as Commander in Chief embraces the authority to command and direct the armed forces in their immediate movements and operations designed to protect the security and effectuate the defense of the United States. . . . [T]his authority undoubtedly includes the power to dispose of troops and equipment in such manner and on such duties as best to promote the safety of the country.
Training of British Flying Students in the United States, 40 Op. Att'y Gen. 58, 61-62 (1941).(11) Other Attorneys General have defended similar accounts of the President constitutional powers and duties, particularly in times of unforeseen emergencies.
Attorney General William P. Barr, quoting the opinion of Attorney General Jackson just cited, advised the President in 1992 that "[y]ou have authority to commit troops overseas without specific prior Congressional approval 'on missions of good will or rescue, or for the purpose of protecting American lives or property or American interests.'" Authority to Use United States Military Forces in Somalia, 16 Op. O.L.C. at 6 (citation omitted).
Attorney General (later Justice) Frank Murphy, though declining to define precisely the scope of the President's independent authority to act in emergencies or states of war, stated that:
the Executive has powers not enumerated in the statutes - powers derived not from statutory grants but from the Constitution. It is universally recognized that the constitutional duties of the Executive carry with them the constitutional powers necessary for their proper performance. These constitutional powers have never been specifically defined, and in fact cannot be, since their extent and limitations are largely dependent upon conditions and circumstances. . . . The right to take specific action might not exist under one state of facts, while under another it might be the absolute duty of the Executive to take such action.
Request of the Senate for an Opinion as to the Powers of the President "In Emergency or State of War," 39 Op. Att'y Gen. 343, 347-48 (1939).
Attorney General Thomas Gregory opined in 1914 that "[i]n the preservation of the safety and integrity of the United States and the protection of its responsibilities and obligations as a sovereignty, [the President's] powers are broad." Censorship of Radio Stations, 30 Op. Att'y Gen. 291, 292 (1914).
Finally, in 1898, Acting Attorney General John K. Richards wrote:
The preservation of our territorial integrity and the protection of our foreign interests is intrusted, in the first instance, to the President. . . . In the protection of these fundamental rights, which are based upon the Constitution and grow out of the jurisdiction of this nation over its own territory and its international rights and obligations as a distinct sovereignty, the President is not limited to the enforcement of specific acts of Congress. [The President] must preserve, protect, and defend those fundamental rights which flow from the Constitution itself and belong to the sovereignty it created.
Foreign Cables, 22 Op. Att'y Gen. 13, 25-26 (1898). Acting Attorney General Richards cited, among other judicial decisions, Cunningham v. Neagle, 135 U.S. 1, 64 (1890), in which the Supreme Court stated that the President's power to enforce the laws of the United States "include[s] the rights, duties and obligations growing out of the constitution itself, our international relations, and all the protection implied by the nature of the government under the constitution."
Opinions of the Office of Legal Counsel. Our Office has taken the position in recent Administrations, including those of Presidents Clinton, Bush, Reagan, Carter, and Nixon, that the President may unilaterally deploy military force in order to protect the national security and interests of the United States.
In 1995, we opined that the President "acting without specific statutory authorization, lawfully may introduce United States ground troops into Bosnia and Herzegovina . . . to help the North Atlantic Treaty Organization . . . ensure compliance with the recently negotiated peace agreement." Proposed Deployment of United States Armed Forces in Bosnia and Herzegovina, 19 Op. O.L.C. 327, 327 (1995) (the "Bosnia Opinion"). We interpreted the WPR to "lend[] support to the . . . conclusion that the President has authority, without specific statutory authorization, to introduce troops into hostilities in a substantial range of circumstances." Id. at 335.
In Deployment of United States Armed Forces into Haiti, 18 Op. O.L.C. 173 (1994), we advised that the President had the authority unilaterally to deploy some 20,000 troops into Haiti. We relied in part on the structure of the WPR, which we argued "makes sense only if the President may introduce troops into hostilities or potential hostilities without prior authorization by the Congress." Id. at 175-76. We further argued that "in establishing and funding a military force that is capable of being projected anywhere around the globe, Congress has given the President, as Commander in Chief, considerable discretion in deciding how that force is to be deployed." Id. at 177. We also cited and relied upon the past practice of the executive branch in undertaking unilateral military interventions:
In 1940, after the fall of Denmark to Germany, President Franklin Roosevelt ordered United States troops to occupy Greenland, a Danish possession in the North Atlantic of vital strategic interest to the United States. . . . Congress was not consulted or even directly informed. . . . Later, in 1941, the President ordered United States troops to occupy Iceland, an independent nation, pursuant to an agreement between himself and the Prime Minister of Iceland. The President relied upon his authority as Commander in Chief, and notified Congress only after the event. . . . More recently, in 1989, at the request of President Corazon Aquino, President Bush authorized military assistance to the Philippine government to suppress a coup attempt.
Id. at 178.
In Authority to Use United States Military Forces in Somalia, 16 Op. O.L.C. at 8, our Office advised that the President had the constitutional authority to deploy United States Armed Forces into Somalia in order to assist the United Nations in ensuring the safe delivery of relief to distressed areas of that country. We stated that "the President's role under our Constitution as Commander in Chief and Chief Executive vests him with the constitutional authority to order United States troops abroad to further national interests such as protecting the lives of Americans overseas." Id. at 8. Citing past practice (further discussed below), we pointed out that
[f]rom the instructions of President Jefferson's Administration to Commodore Richard Dale in 1801 to 'chastise' Algiers and Tripoli if they continued to attack American shipping, to the present, Presidents have taken military initiatives abroad on the basis of their constitutional authority. . . . Against the background of this repeated past practice under many Presidents, this Department and this Office have concluded that the President has the power to commit United States troops abroad for the purpose of protecting important national interests.
Id. at 9 (citations omitted).
In Overview of the War Powers Resolution, 8 Op. O.L.C. 271, 275 (1984), we noted that "[t]he President's authority to deploy armed forces has been exercised in a broad range of circumstances [in] our history."
In Presidential Power to Use the Armed Forces Abroad Without Statutory Authorization, 4A Op. O.L.C. 185, 187 (1980), we stated that
[o]ur history is replete with instances of presidential uses of military force abroad in the absence of prior congressional approval. This pattern of presidential initiative and congressional acquiescence may be said to reflect the implicit advantage held by the executive over the legislature under our constitutional scheme in situations calling for immediate action. Thus, constitutional practice over two centuries, supported by the nature of the functions exercised and by the few legal benchmarks that exist, evidences the existence of broad constitutional power.
In light of that understanding, we advised that the President had independent constitutional authority unilaterally to order "(1) deployment abroad at some risk of engagement - for example, the current presence of the fleet in the Persian Gulf region; (2) a military expedition to rescue the hostages or to retaliate against Iran if the hostages are harmed; (3) an attempt to repel an assault that threatens our vital interests in that region." Id. at 185-86. See also Presidential Powers Relating to the Situation in Iran, 4A Op. O.L.C. 115, 121 (1979) ("It is well established that the President has the constitutional power as Chief Executive and Commander-in-Chief to protect the lives and property of Americans abroad. This understanding is reflected in judicial decisions
. . . and recurring historic practice which goes back to the time of Jefferson.").
Finally, in the Rehnquist Memo at 8, we concluded that the President as Commander in Chief had the authority "to commit military forces of the United States to armed conflict . . . to protect the lives of American troops in the field."
Judicial Construction. Judicial decisions since the beginning of the Republic confirm the President's constitutional power and duty to repel military action against the United States through the use of force, and to take measures to deter the recurrence of an attack. As Justice Joseph Story said long ago, "[i]t may be fit and proper for the government, in the exercise of the high discretion confided to the executive, for great public purposes, to act on a sudden emergency, or to prevent an irreparable mischief, by summary measures, which are not found in the text of the laws." The Apollon, 22 U.S. (9 Wheat.) 362, 366-67 (1824). The Constitution entrusts the "power [to] the executive branch of the government to preserve order and insure the public safety in times of emergency, when other branches of the government are unable to function, or their functioning would itself threaten the public safety." Duncan v. Kahanamoku, 327 U.S. 304, 335 (1946) (Stone, C.J., concurring).
If the President is confronted with an unforeseen attack on the territory and people of the United States, or other immediate, dangerous threat to American interests and security, the courts have affirmed that it is his constitutional responsibility to respond to that threat with whatever means are necessary, including the use of military force abroad. See, e.g., Prize Cases, 67 U.S. at 635 ("If a war be made by invasion of a foreign nation, the President is not only authorized but bound to resist force by force . . . without waiting for any special legislative authority."); Kahanamoku, 327 U.S. at 336 (Stone, C.J., concurring) ("Executive has broad discretion in determining when the public emergency is such as to give rise to the necessity" for emergency measures); United States v. Smith, 27 F. Cas. 1192, 1230 (C.C.D.N.Y. 1806) (No. 16,342) (Paterson, Circuit Justice) (regardless of statutory authorization, it is "the duty . . . of the executive magistrate . . . to repel an invading foe") (12); Mitchell v. Laird, 488 F.2d 611, 613 (D.C. Cir. 1973) ("there are some types of war which without Congressional approval, the President may begin to wage: for example, he may respond immediately without such approval to a belligerent attack") (13); see also Campbell v. Clinton, 203 F.3d 19, 27 (D.C. Cir.) (Silberman, J. concurring) ("[T]he President has independent authority to repel aggressive acts by third parties even without specific statutory authorization."), cert. denied, 531 U.S. 815 (2000);id. at 40 (Tatel, J., concurring) ("[T]he President, as Commander in Chief, possesses emergency authority to use military force to defend the nation from attack without obtaining prior congressional approval."); Story, supra note 9, § 1485 ("[t]he command and application of the public force . . . to maintain peace, and to resist foreign invasion" are executive powers).
III.
The historical practice of all three branches confirms the lessons of the constitutional text and structure. The normative role of historical practice in constitutional law, and especially with regard to separation of powers, is well settled. (14) Both the Supreme Court and the political branches have often recognized that governmental practice plays a highly significant role in establishing the contours of the constitutional separation of powers: "a systematic, unbroken, executive practice, long pursued to the knowledge of the Congress and never before questioned . . . may be treated as a gloss on 'executive Power' vested in the President by § 1 of Art. II." Youngstown Sheet & Tube Co., 343 U.S. at 610-11 (Frankfurter, J., concurring). Indeed, as the Court has observed, the role of practice in fixing the meaning of the separation of powers is implicit in the Constitution itself: "'the Constitution . . . contemplates that practice will integrate the dispersed powers into a workable government.'" Mistretta v. United States, 488 U.S. 361, 381 (1989) (citation omitted). In addition, governmental practice enjoys significant weight in constitutional analysis for practical reasons, on "the basis of a wise and quieting rule that, in determining . . . the existence of a power, weight shall be given to the usage itself - even when the validity of the practice is the subject of investigation." United States v. Midwest Oil Co., 236 U.S. 459, 473 (1915).
The role of practice is heightened in dealing with issues affecting foreign affairs and national security, where "the Court has been particularly willing to rely on the practical statesmanship of the political branches when considering constitutional questions." Whether Uruguay Round Agreements Required Ratification as a Treaty, 18 Op. O.L.C. 232, 234 (1994). "The persistence of these controversies (which trace back to the eighteenth century), and the nearly complete absence of judicial decisions resolving them, underscore the necessity of relying on congressional precedent to interpret the relevant constitutional provisions." Id. at 236. Accordingly, we give considerable weight to the practice of the political branches in trying to determine the constitutional allocation of warmaking powers between them.
The historical record demonstrates that the power to initiate military hostilities, particularly in response to the threat of an armed attack, rests exclusively with the President. As the Supreme Court has observed, "[t]he United States frequently employs Armed Forces outside this country - over 200 times in our history - for the protection of American citizens or national security." United States v. Verdugo-Urquidez, 494 U.S. 259, 273 (1990). On at least 125 such occasions, the President acted without prior express authorization from Congress. See Bosnia Opinion, 19 Op. O.L.C. at 331. Such deployments, based on the President's constitutional authority alone, have occurred since the Administration of George Washington. See David P. Currie, The Constitution in Congress: Substantive Issues in the First Congress, 1789-1791, 61 U. Chi. L. Rev. 775, 816 (1994) ("[B]oth Secretary [of War] Knox and [President] Washington himself seemed to think that this [Commander in Chief] authority extended to offensive operations taken in retaliation for Indian atrocities.") (quoted in Bosnia Opinion, 19 Op. O.L.C. at 331 n.4. Perhaps the most significant deployment without specific statutory authorization took place at the time of the Korean War, when President Truman, without prior authorization from Congress, deployed United States troops in a war that lasted for over three years and caused over 142,000 American casualties. See Bosnia Opinion, 19 Op. O.L.C. at 331-32 n.5.
Recent deployments ordered solely on the basis of the President's constitutional authority have also been extremely large, representing a substantial commitment of the Nation's military personnel, diplomatic prestige, and financial resources. On at least one occasion, such a unilateral deployment has constituted full-scale war. On March 24, 1999, without any prior statutory authorization and in the absence of an attack on the United States, President Clinton ordered hostilities to be initiated against the Republic of Yugoslavia. The President informed Congress that, in the initial wave of air strikes, "United States and NATO forces have targeted the [Yugoslavian] government's integrated air defense system, military and security police command and control elements, and military and security police facilities and infrastructure. . . . I have taken these actions pursuant to my constitutional authority to conduct U.S. foreign relations and as Commander in Chief and Chief Executive." Letter to Congressional leaders reporting on airstrikes against Serbian targets in the Federal Republic of Yugoslavia (Serbia and Montenegro), 1 Pub. Papers of William Jefferson Clinton 459, 459 (1999). Bombing attacks against targets in both Kosovo and Serbia ended on June 10, 1999, seventy-nine days after the war began. More than 30,000 United States military personnel participated in the operations; some 800 U.S. aircraft flew more than 20,000 sorties; more than 23,000 bombs and missiles were used. As part of the peace settlement, NATO deployed some 50,000 troops into Kosovo, 7,000 of them American. (15) In a News Briefing on June 10, 1999, Secretary of Defense William S. Cohen summarized the effects of the campaign by saying,
[t]hree months ago Yugoslavia was a heavily armed country with a significant air defense system. We reduced that defense system threat by destroying over 80 percent of Yugoslavia's modern aircraft fighters and strategic suface-to-air missiles. NATO destroyed a significant share of the infrastructure Yugoslavia used to support[] its military with, we reduced his capacity to make ammunition by two-thirds, and we eliminated all of its oil refining capacity and more than 40 percent of its military fuel supplies, Most important, we severely crippled the military forces in Kosovo by destroying more than 50 percent of the artillery and more than one-third of the armored vehicles. (16)
General Shelton of the Joint Chiefs of Staff reported that "about half of [Yugoslavia's] defense industry has either been damaged or destroyed. . . . [A]viation, 70 percent; armored vehicle production, 40 [percent]; petroleum refineries, 100 percent down; explosive production, about 50 percent; and 65 percent of his ammunition. . . . For the most part Belgrade is a city that's got about probably 70 percent without [electrical] power." (17) A report by General Ryan, Air Force Chief of Staff, on June 8, 1999, stated that
Serbia's air force is essentially useless and its air defenses are dangerous but ineffective. Military armament production is destroyed. Military supply areas are under siege. Oil refinement has ceased and petroleum storage is systematically being destroyed. Electricity is sporadic, at best. Major transportation routes are cut. NATO aircraft are attacking with impunity throughout the country. (18)