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[The Congress shall have Power . . . ] To declare War, grant Letters of Marque and Reprisal, and make Rules concerning Captures on Land and Water; . . .

The Declare War Clause is a central element of Congress’s war powers and its meaning is among those most heavily debated.¹ The Supreme Court has observed that only Congress has the power to declare war,² but the implications of this exclusive assignment are not well-settled. In particular, the relationship between Congress’s power to declare war and the President’s war powers granted under Article II of the Constitution is a subject of significant disagreement.³

The first draft of the Constitution considered in Philadelphia in 1787 would have given Congress the power to make war, but the Framers substituted the word declare in what James Madison described as an effort to ensure that the President was empowered to repel sudden attacks.⁴ Under Congress’s interpretation of the Constitution, the President may introduce troops into hostile circumstances if Congress has (1) declared war, (2) specifically authorized the President to use force, or (3) there is a national emergency created by an attack on the United States or its territories.⁵ The executive branch claims much broader authority and asserts that the Constitution empowers the President to initiate and engage in many types of military action without congressional authorization.⁶

While this interbranch debate remains active, other questions concerning the Declare War Clause have been settled by longstanding practice and judicial opinions. For example, the Supreme Court has recognized that Congress need not issue a formal declaration of war to authorize the United States to engage in military action.⁷ Congress also can, by statute, authorize the President to use force within defined parameters that do not rise to the level of a general declaration of war.⁸ The United States has issued declarations of war against eleven countries during five conflicts, but it has not formally declared war since World War II.⁹ As a result, statutory authorizations have become the predominant method for Congress to permit military action since the Second World War.¹⁰

The Supreme Court has also observed that the Declare War Clause confers broad authority upon Congress to pursue the war effort.¹¹ The power to Declare War, the Supreme Court stated in 1870, involves the power to prosecute it by all means and in any manner in which war may be legitimately prosecuted.¹² In line with this interpretation, Congress has enacted an extensive set of statutes that trigger a host of special wartime authorities concerning the military, foreign trade, energy, communications, alien enemies, and other issues if Congress declares war.¹³