The US Senate has passed a resolution calling on President Donald Trump to halt military action against Iran unless Congress provides specific authorisation. The measure, which also passed the House of Representatives, reflects growing concern among lawmakers about the constitutional limits of presidential war powers. Although the resolution is largely symbolic and unlikely to become law, its approval by members of both major political parties highlights increasing debate over the ongoing conflict and the role of Congress in decisions about war. The resolution comes as negotiations continue in Switzerland between the USA and Iran following months of regional conflict and military strikes. Supporters argue that Congress alone has the authority to authorise war, while opponents warn that the resolution could weaken the country’s position in the talks. The vote also reflects wider public concern about the costs, consequences and potential escalation of military conflict in the Middle East.