This resolution would require the President to pull U.S. military forces out of any combat involving Iran, unless Congress has specifically voted to declare war or authorize that military action. Right now, presidents can sometimes order military action without a fresh vote from Congress, and this measure is Congress's way of asserting that it — not just the President alone — should decide whether U.S. troops fight Iran. It includes one exception: U.S. forces could still act in self-defense if the U.S. or its personnel or bases somewhere else in the world came under attack.