US Senate votes to pass Iran war powers resolution in blow to Trump

What Happened

The United States Senate voted 50–48 on Tuesday to pass a war powers resolution directing President Donald Trump to remove US armed forces from hostilities against Iran unless explicitly authorized by a declaration of war or specific congressional authorization. The resolution, which previously passed the House of Representatives, saw four Republican senators — Bill Cassidy, Lisa Murkowski, Susan Collins, and Rand Paul — join all but one Democrat (John Fetterman) in support. The measure represents the first successful passage of a war powers resolution by both chambers, but is expected to be vetoed by President Trump. It exempts actions necessary to prevent an 'imminent attack' against the US or its allies. The vote comes amid ongoing US-Iran ceasefire negotiations in Switzerland following a June 17 memorandum of understanding; critics argued the resolution could torpedo talks, while supporters condemned the war triggered by US-Israeli strikes on Iran from February 28 as a costly blunder.

Key Actors

Why It Matters

The bipartisan Senate vote reflects growing congressional and public opposition to a war that has spiked oil and fertilizer prices due to a Strait of Hormuz blockade and proved deeply unpopular, with only 24% approval in a Reuters/Ipsos poll. The resolution's passage, even if vetoed, signals weakening political support for Trump's Iran policy and could influence midterm elections. For the Lebanon conflict, Israel's continued strikes despite the ceasefire indicate a spillover that complicates the broader regional ceasefire framework.

Watch For

President Trump's expected veto and whether Congress attempts an override; outcomes of US-Iran ceasefire talks in Switzerland and whether Iran walks away as Senator James Risch warned; Israel's ongoing military operations in Lebanon that breach the ceasefire terms; midterm elections in November that may shift Congressional control and further constrain the president's war-making ability.