Under the 1973 law, Congress must authorize military action within 60 days of its start or require its end. The deadline followed U.S. operations that began on Feb. 28, but Senate Republicans took no action before leaving for a one-week recess.

Senate Majority Leader John Thune said he did not expect a vote on authorizing force in Iran, while Defense Secretary Pete Hegseth argued the deadline no longer applied because a ceasefire with Iran that began in early April had effectively paused the conflict.

Democrats rejected that claim, saying U.S. military operations continue as the Navy enforces a blockade linked to the Strait of Hormuz crisis.

Some Republicans, including Senators Lisa Murkowski and Susan Collins, said Congress should still have a formal role, with Collins calling the deadline “a requirement” and not a suggestion.