Senate Advances Resolution Limiting Trumps Authority to Engage in Military Action Against Iran

May 20, 2026 • Al Jazeera

Senate Advances Resolution Limiting Trumps Authority to Engage in Military Action Against Iran

US Senate Advances War Powers Resolution Amid Growing Pressure on Iran Conflict

The US Senate has passed a procedural measure to advance a War Powers Resolution, which could potentially limit President Donald Trump’s ability to use military force against Iran without congressional authorization. The vote was held on Tuesday and resulted in a 50-47 margin, with several Republicans joining Democratic colleagues to support the measure.

A handful of Republican senators voted in favor of advancing the resolution, marking a rare rebuke of the president. The vote reflects growing unease among some lawmakers about the ongoing conflict in Iran, which has shown no signs of ending despite a fragile ceasefire.

The resolution’s passage is seen as a victory for lawmakers who argue that Congress, not the president, should have the power to send troops to war, as outlined in the US Constitution. However, the measure faces significant hurdles if it is to become law, including a potential veto from President Trump and approval from the Republican-led House of Representatives.

Three Republicans were absent during the vote, which would be enough to defeat the measure if they maintain their stance on the issue. The resolution must also garner two-thirds majorities in both the House and Senate to survive an expected Trump veto.

The vote comes as pressure on President Trump grows over his handling of the conflict, with some lawmakers calling for him to seek congressional authorization before proceeding with military action. The administration maintains that the president’s actions are within his rights as commander-in-chief and responsibility to protect the US.

A 1973 US war powers law governs the use of military force in such situations, requiring a president to end hostilities after 60 days or seek congressional approval for an extension. Despite this, President Trump declared a ceasefire with Iran on May 1, but US troops continue to blockade Iranian ports and attack shipping vessels, while Tehran’s forces block access to the Strait of Hormuz and have attacked US vessels.

The conflict has sparked opposition from some lawmakers and legal experts, who argue that it violates international law.

Source: Al Jazeera