Senate Advances Resolution to Limit Military Action in Iran

On May 19, 2026, the U.S. Senate advanced a resolution aimed at limiting President Donald Trump's ability to continue military operations in Iran without congressional authorization. The procedural vote passed 50-47, signaling bipartisan concern over the ongoing conflict that began in late February.

A notable development was the support from Republican Senator Bill Cassidy of Louisiana, who shifted his stance after losing a primary election to a Trump-endorsed challenger. Cassidy joined fellow Republicans Rand Paul of Kentucky, Susan Collins of Maine, and Lisa Murkowski of Alaska in backing the measure. Democratic Senator John Fetterman of Pennsylvania opposed the resolution.

The resolution seeks to compel the president to obtain congressional approval for the war or withdraw U.S. troops. While the measure faces a final vote in the Senate and would need to pass the House, it is unlikely to become law due to the expectation of a presidential veto. However, the vote reflects growing bipartisan unease over the conflict's duration and its economic impact, including rising gas prices.

The Trump administration maintains that the War Powers Act's 60-day requirement for congressional authorization does not apply, citing a ceasefire declared in early April. Defense Secretary Pete Hegseth suggested that the ceasefire pauses the War Powers countdown, though critics argue that ongoing military activities, such as the blockade of Iranian oil shipments, constitute continued hostilities.

The House is expected to vote on a similar resolution, reflecting the ongoing debate over the executive branch's military authority and the role of Congress in authorizing the use of force.