The measure passed 214-208, with four Republicans joining Democrats in support. As a concurrent resolution, it does not require the president's signature and is unlikely to change US policy.

The vote came as the United States continued airstrikes on Iranian military targets and Iran launched attacks on US bases and allied Gulf states. The conflict has also spread to regional shipping routes, with Yemen's Houthi group claiming attacks on Saudi oil tankers in the Red Sea.

Democrats argued that the military campaign lacks congressional approval and violates the Constitution, while most Republicans defended the administration's actions. The Senate later rejected a similar Democratic-led war powers resolution.