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Get the Facts: What's the process to declare war?

Since 1812, Congress has declared war 11 times, while presidents have used military force under commander-in-chief powers or congressional authorizations for military force.

  • According to the U.S. Constitution, Congress — not the president — has the authority to declare war, requiring a majority vote in both chambers.
  • President George W. Bush used commander-in-chief powers to deploy U.S. forces after Sept. 11, while Congress passed an Authorization for Use of Military Force.
  • Since 1812, Congress has formally declared war 11 times, with the last declarations in 1942 during World War II.
  • Recent public comments by President Donald Trump and Defense Secretary Pete Hegseth using the word "war" about Iran have prompted some lawmakers to question constitutional compliance.
  • The Constitution assigns Congress the power to declare war, requiring majority votes, but the U.S. has fought major conflicts without formal declarations, with courts recognizing presidential authority in emergencies.
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Get the Facts: What's the process to declare war?

Who has the power to declare war? As leaders use the word "war" in reference to Iran, here's what the Constitution says about Congress, the president and military authority.

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KCRA 3 broke the news in Sacramento, United States on Monday, March 2, 2026.
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