On June 23, 2026, Senate Democrats, with support from some Republicans, passed a war powers resolution opposing President Donald Trump's actions in Iran. The resolution passed with a vote of 50 to 48, aided by the absence of Senators Mitch McConnell and Dave McCormick. This resolution follows a similar measure that passed in the House earlier in the month, marking a rare instance of House Republicans breaking from Trump. However, the resolution lacks legally binding authority and will not be sent to the President for approval, where it would likely face a veto.
The vote coincides with ongoing discussions in Congress regarding a memorandum of understanding (MOU) between the U.S. and Iran, which has extended negotiations for a potential peace deal. Some Republicans have expressed concerns about the MOU, comparing it to former President Barack Obama's Iran nuclear deal. Senate Armed Services Committee Chair Roger Wicker criticized the MOU, particularly the proposed $300 billion reconstruction fund, stating it undermines previous military successes.
Senate Majority Leader John Thune emphasized the need for conditions tied to any lifting of sanctions on Iran, while Senator Tim Kaine called for Congress to reassess its role in decisions regarding military action. Congress is also preparing to review an $80 billion supplemental spending request from the Pentagon to cover war costs, which is significantly higher than earlier estimates.