In Historic First, Congress Passes Concurrent War Powers Resolution to End Iran War

The bill passed the Senate in a vote of 50-48 after it was advanced by the House

by Dave DeCamp | June 23, 2026 

https://news.antiwar.com/2026/06/23/in-historic-first-congress-passes-concurrent-war-powers-resolution-to-end-iran-war/

The Senate on Tuesday approved a House-passed concurrent War Powers Resolution directing President Trump to end hostilities against Iran, marking the first time Congress has approved a concurrent resolution under the 1973 War Powers Act directing the termination of an unauthorized war.

In previous years, Congress has passed joint resolutions directing the president to end wars, such as the 2019 bill to end US support for the Saudi war in Yemen, which President Trump vetoed at the time, but a concurrent resolution doesn’t require the president’s signature.

Section 5(c) of the 1973 War Powers Act states that “at any time that United States Armed Forces are engaged in hostilities outside the territory of the United States, its possessions and territories without a declaration of war or specific statutory authorization, such forces shall be removed by the President if the Congress so directs by concurrent resolution.”

The bill passed the Senate on Tuesday by a 50-48 vote, with four Republicans — Senators Rand Paul (KY), Lisa Murkowski (AK), Susan Collins (ME), and Bill Cassidy (LA) — voting in favor. Senator Jon Fetterman (PA) was the only Democrat to oppose the effort, and Republican Senators Mitch McConnell (KY) and Dave McCormick (PA) were not present for the vote.

Trump administration officials will likely claim that the vote is meaningless since there is currently a ceasefire between the US and Iran as they negotiate a deal under the Memorandum of Understanding, but proponents of the War Powers effort say the passage of the concurrent resolution means the administration is now legally bound not to restart the war without congressional authorization.

Rep. Ro Khanna (D-CA), who sponsored the legislation in the House, told The Lever earlier this month that if the resolution passed the Senate, he would work with “House counsel to urge leadership to bring a court case to enforce the Iran War Powers Resolution.”

While the US and Iran have been engaged in negotiations, President Trump has continued issuing threats against Iran and has maintained forces in the region to potentially re-impose the blockade or restart the bombing campaign.