On December 13th, 2018, the Senate voted to end US involvement in the Saudi-led war in Yemen. This NPR article states, "the House would have to pass the resolution by year's end and President Trump would have to sign it." I searched and found the actual text of the resolution (Senate Joint resolution 54). The first line states, "To direct the removal of United States Armed Forces from hostilities in the Republic of Yemen that have not been authorized by Congress."

Requiring the President to sign the resolution means he effectively makes the final decision on the matter (by signing or not signing), even though from a constitutional perspective (at least through the lens of the War Powers act), Congress is supposed to make the final decision about whether to be at war through a simple majority vote (not a veto override).

There's two parts to my question. Firstly, if the hostilities weren't authorized in the first place (making them unlawful under the War Powers Act), why does Congress need the President's permission? It seems backwards to me.

Secondly, I looked at the text of the War Power act, (50 U.S.C. 1544(c)), and it states,

Notwithstanding subsection (b), at any time that United States Armed Forces are engaged in hostilities outside the territory of the United States, its possessions and territories without a declaration of war or specific statutory authorization, such forces shall be removed by the President if the Congress so directs by concurrent resolution.

This is the provision cited in Senate Joint Resolution 54. And that's precisely the issue. Why is this a joint resolution (which requires the President's signature) when the War Powers act only requires a concurrent resolution (which doesn't require the President's signature)? Is this a mistake by the sponsors of the resolution? Is it a way to avoid constitutional issues?

2 Answers 2


Presidential approval is not needed.

Congress can instead defund a war with appropriations bills by expressly prohibiting the use of appropriated funds for activities involved in a particular war. Congress has rarely done this (although two examples of it doing so are listed in the comments to this answer), and has frequently threatened to do so in order to get Presidential cooperation with it in military matters.

In practice, however, most wars are ended not with unilateral withdrawal, which is what defunding a war would do, but with a treaty. And, treaty making power is vested in the President, subject to U.S. Senate supermajority approval by the U.S. Constitution. Also, it is much more practical to have the President supervise military affairs to end a war elegantly than to use the blunt instrument of defunding a war.

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    Congress specifically prevented funding from being used to defeat North Vietnam's second tank invasion of South Vietnam. This was the proximate cause of South Vietnam's defeat. Congress also specifically cut off funding for the Contra rebels in Nicaragua. Ollie North got around this restriction via the activities that comprised the Iran-Contra scandal.
    – Jasper
    Commented Jan 15, 2019 at 1:20
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    @Jasper Amended accordingly.
    – ohwilleke
    Commented Jan 15, 2019 at 1:40
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    This is an interesting response to the first part of my question I hadn't considered, but it still doesn't answer why the resolution was formulated as a joint resolution, which is ultimately what I'm interested in. Admittedly, my question isn't well formed since the second part is an answer to the first part but is also itself a question. If anyone has suggestions for how to correct that (e.g. should I separate into two questions or just edit the first part out?) I'd appreciate it.
    – user234683
    Commented Apr 21, 2019 at 19:04

Per the Constitution, the President is the Commander in Chief of the US Armed forces. Yes, the power of Congress to declare war appears to be in conflict with this. In practice, the conflict seems to have been resolved in favor of the President. The same can be said of the War Powers Act.

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    Can you tie this more directly to the OPs question? It's not obvious that the role of Commander in Chief explains the particular legislative tools being used. Commented Jan 11, 2019 at 16:39

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