US President Donald Trump on Tuesday lashed out at the Senate after it approved a resolution aimed at limiting any further US military action against Iran without congressional authorisation, accusing a group of Republican lawmakers of undermining his negotiating position and providing "aid and comfort" to America’s adversaries.
In a post on Truth Social, Trump claimed Iran was in a weakened position and ready to make major concessions when the Senate moved ahead with what he described as a "poorly timed and meaningless War Powers Act vote." He argued that he had Iran on the ropes, ready to concede and willing to give practically anything while respecting the United States and its president. He strongly criticised four Republican senators who joined Democrats in backing the measure, branding them "Republican Losers" and arguing that the vote had complicated his administration’s efforts to deal with Tehran. Whilst he acknowledged these senators had made his job more difficult, he insisted he would still get it done one way or another.
Trump’s criticism came hours after the Republican-controlled Senate voted 50-48 in favour of a war powers resolution seeking to restrict any further escalation with Iran unless explicitly authorised by Congress, even as Washington continues negotiations on a potential peace agreement with Tehran. The measure had already passed the House earlier this month, marking the first time since the War Powers Resolution of 1973 that both chambers of Congress have approved a measure directing a president to remove US forces from hostilities.
Whilst largely symbolic, the vote represents a notable political setback for Trump and reflects growing unease in Congress over the conflict that began on February 28 when the United States and Israel launched military action against Iran. The Senate action also comes as the administration is expected to seek congressional approval for tens of billions of dollars in funding linked to the ongoing conflict, sharpening scrutiny of the White House’s war strategy.
The vote exposed divisions within Trump’s Republican Party, with four GOP senators — Susan Collins, Rand Paul, Bill Cassidy and Lisa Murkowski — joining Democrats in support. Conversely, Democratic Senator John Fetterman voted against the measure, while Republican senators Mitch McConnell and David McCormick were absent. These defections underscore growing discomfort among some Republicans over the scope of US military involvement and presidential war-making powers, even though Trump has largely retained party backing on foreign policy.
During the debate, Democrats argued that Congress, rather than the president, holds the constitutional authority over decisions to go to war, with Democratic Senator Tim Kaine urging support by stating that Congress had to own this responsibility. However, the resolution’s practical effect remains uncertain. Under the 1973 War Powers Act, such concurrent resolutions are intended to serve as a congressional mechanism to end military operations without requiring presidential approval. Yet legal experts note the law’s authority has never been fully tested in this form. A 1983 US Supreme Court ruling also raised questions about whether such measures require a presidential signature to take effect, whilst the White House maintains the statute is unconstitutional and not binding on the executive branch.
A White House official downplayed the significance of the event, stating the Senate vote carries no legal force and arguing it passed only due to the absence of the two Republican senators. The official also noted that US hostilities were considered terminated following a ceasefire on April 7. Scott Anderson of the Brookings Institution suggested the executive branch would likely ignore the measure on constitutional grounds, adding that it remains unclear who would have standing to challenge it in court.
Ultimately, the vote comes as the Trump administration continues efforts to negotiate a peace agreement with Iran. Supporters of the resolution believe it could increase political pressure on the president and make it harder to resume military action if diplomacy collapses. This broader debate could also extend to any eventual deal with Tehran, as a 2015 law governing congressional review of agreements related to Iran’s nuclear programme means lawmakers would be able to scrutinise and vote on any future peace or nuclear arrangement.
Also read: Trump says ‘no further’ Hormuz blockade
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