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handle is hein.crs/goveqto0001 and id is 1 raw text is: The Declare War Clause, Part 8: Vietnam War
Through 21st-Century Conflicts
September 30, 2024
This Legal Sidebar is the last in an eight-part series that discusses the Declare War Clause in Article I,
Section 8, Clause 11 of the Constitution, which grants Congress the power To declare War, grant Letters
of Marque and Reprisal, and make Rules concerning Captures on Land and Water[.] The power to take
the nation to war is a central element of the Constitution's scheme of war powers, but interpretation of the
Declare War Clause is complex and evolving. This Sidebar series discusses the Supreme Court's
jurisprudence related to declarations of war by Congress and highlights interbranch practices that
illuminate the executive and legislative branches' sometimes differing interpretations of the clause. This
Sidebar examines the President's authority to take military action absent a declaration of war or clear
statutory authorization from Congress. Additional information on Congress's war powers and the
President's powers as Commander-in-Chief can be found in the Constitution Annotated.
The Vietnam War
After North Vietnamese patrol boats reportedly attacked U.S. naval vessels in international waters in
Southeast Asia, Congress enacted a joint resolution, known as the Gulf of Tonkin Resolution, authorizing
the President to take all necessary measures to repel any armed attack against the forces of the United
States and to prevent further aggression. As the conflict unfolded and spread beyond Vietnam's borders,
some Members of Congress questioned whether military operations had become so extensive that they
exceed the Gulf of Tonkin Resolution's scope and required a declaration of war. President Lyndon
Johnson claimed the Constitution alone provided sufficient authority and would have done so even if
Congress never enacted the Gulf of Tonkin Resolution. Executive branch attorneys, on the other hand,
relied on a combination of the President's Article II powers and the Gulf of Tonkin Resolution as
domestic legal authorities. In an executive branch legal opinion addressing the introduction of U.S. forces
into Cambodia, then-Assistant Attorney General (and later Chief Justice of the Supreme Court) William
Rehnquist took the view that the military action fell short of war and was the sort of tactical decision
traditionally confided to the Commander in Chief in the conduct of armed conflict.
In 1971, Congress passed and President Nixon signed laws repealing the Gulf of Tonkin Resolution and
calling for the prompt and orderly withdrawal of U.S. troops at the earliest practicable date. U.S.
Congressional Research Service
https://crsreports.congress.gov
LSB11237
CRS Legal Sidebar
Prepared for Members and

Committees of Congress