The US Senate began voting on 4 March 2026 on a bipartisan war powers resolution aimed at ending US military action against Iran without congressional approval. The measure would require explicit authorisation from Congress for any further action against Iran. One of the main sponsors is Senator Tim Kaine of Virginia, who pointed to Congress’s constitutional role in decisions on war.
The House of Representatives is scheduled to vote on a similar resolution on 5 March. House Speaker Mike Johnson said on 3 March there were enough votes for the measure to be defeated. Johnson made the comment after a closed briefing on the conflict attended by senior administration officials. Even if the resolution passes both chambers, it would need two-thirds majorities in the Senate and the House to survive an expected veto by President Donald Trump.
The votes are taking place as US military operations against Iran enter their fifth day, and US casualties have been reported.