I'd like to know if Trump decides to carry out a military action against Iran, can it be prevented by the Congress? In other words, I want to know which steps are needed to declare war (approval by senate, house or both?). As I know, in the coming congress, Democrats have the majority; can they prevent the president entering into war?


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Actually, this has been a debate that has been going on as long as the constitution has existed and came into closer focus during the Vietnam War.

According to the constitution, the president is the Commander-in-chief of the armed forces. He can order the army to invade without Congressional approval. That being said he CANNOT declare war. Only the congress can do that.

It doesn't sound like I have answered your question, does it? Well the truth is, he can order the armed forces to invade a country, but he can't declare war formally. That is why the Vietnam and Korean Wars are often called "police actions" because the president ordered the use of troops without a formal declaration of war being declared by congress.

So he can invade a country, but he can't stay there indefinitely without the support of congress, though the constitution never defines the length as to what is an reasonable amount of time.

In 1973, in response to the long occupation of Vietnam, congress passed the War Powers Resolution to try to limit the power of the president to use the armed forces, though it's constitutionality has been questioned. Many on the other hand say it is completely appropriate.

So to summarize and clarify, he can start military action, but he can't formally declare war on a country. So the opposition majority in Congress can't prevent the president from starting a military action. They can control the money and prevent it from being funded, though that might be a risky political strategy.

  • For improvement - he can start something, but if he wants any kind of forces to be committed longer than 60 days (plus 30 for draw-down, so 90 total), he must get Congressional approval/authorization, even if it is a "police action." Commented Dec 3, 2018 at 22:57
  • @PoloHoleSet I appreciate your feedback/clarification. Remember the 60 + 30 days rule is true only if the War Powers Resolution is constitutional and it has never been tested.
    – Karlomanio
    Commented Dec 3, 2018 at 23:02
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    Not sure why anyone would think it was not Constitutional, since only Congress has the power to declare war. If anything were questionable, it would be the President's authority to commit our military to any non-defensive action without the explicit approval of Congress. The only ones generally giving lip-service to questioning that are usually pretty extreme on the authoritarian scale. Here's a good read about it - americanbar.org/publications/human_rights_magazine_home/… Commented Dec 3, 2018 at 23:17
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    And of course, if (a supermajority of) Congress is absolutely determined to stop an invasion, there's always the threat of impeachment if the president doesn't back down. Commented Dec 4, 2018 at 0:10
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    @Coditoergosum Just to clarify- I don't think it's politicizing, but some react to the word "Iran" as a form of politicization. To respect those who feel that way and clarify that I am not politicizing, I didn't use it. The question is a good one even using the word "Iran", but it is not necessary to use the country name to answer the question.
    – Karlomanio
    Commented Dec 6, 2018 at 15:36

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