US Senate joins House in voting to halt Iran war

The U.S. Senate has taken a significant step toward halting military action against Iran, passing a war powers resolution that directs President Donald Trump to cease hostilities. This marks the first time both chambers of Congress have approved such a measure since the War Powers Act was enacted in 1973. The resolution, which received overwhelming support from Democrats and a small number of Republicans, reflects mounting frustration within Congress over the ongoing conflict with Iran, which began on February 28. The Senate's 50-48 vote came after the House of Representatives had already passed the measure earlier in the month, signaling a rare bipartisan effort to curtail presidential authority in matters of war.

The resolution was introduced as a response to concerns over the escalating tensions between the United States and Iran, particularly following a series of incidents involving American diplomats and military personnel. While the exact impact of the resolution remains unclear, it represents a formal attempt to assert congressional oversight over the use of military force. The vote was largely along party lines, with four Republicans—among them Senator Susan Collins of Maine—joining all but one Democrat in favor. Two other Republican senators chose not to cast their votes. Despite the narrow margin of victory, the resolution underscores a shift in sentiment among some Republican lawmakers, who have begun to challenge President Trump's aggressive foreign policy stance, especially in light of upcoming midterm elections in November.

The passage of the resolution also highlights the broader political landscape in Washington, where both the Senate and House are controlled by Republicans, albeit with slim majorities. This dynamic has allowed for limited dissent within the GOP ranks, particularly on issues perceived to be politically risky. For instance, several Republicans have recently resisted Trump's proposals, including a $1.8 billion “anti-weaponisation” fund aimed at compensating allies accused of being targeted by federal authorities, as well as a $70 billion funding request for his immigration policies. These actions suggest that some members of Congress are willing to defy the president when they perceive it aligns with public interest or electoral strategy.

Public opinion appears to mirror these internal congressional shifts. Recent polling data indicates that less than a quarter of Americans believe the war with Iran is justified, while a majority expresses skepticism about the likelihood of a lasting truce with Tehran. This sentiment adds pressure on both the administration and Congress to reconsider the trajectory of U.S.-Iran relations. The resolution itself, however, lacks direct enforcement power, as it does not require the president’s signature. Under the War Powers Act, such resolutions are meant to serve as a check on executive authority, though their legal validity remains contentious.

Legal scholars and analysts note that the constitutionality of the War Powers Act is still a matter of debate. A 1983 Supreme Court ruling established that for a war powers resolution to carry legal weight, it must be presented to the president for approval or rejection. The Trump administration has consistently argued that the act is unconstitutional and therefore not binding. A White House spokesperson emphasized that the Senate’s vote holds no legal consequence, as it does not reach the president and is not enforceable. Nevertheless, proponents of the resolution argue that its symbolic value lies in reinforcing the principle that Congress—not the executive—holds the authority to declare war.

As the administration continues its efforts to negotiate a peace deal with Iran, the resolution may serve as a political tool rather than a legal mandate. Congressional leaders, including Representative Gregory Meeks, who sponsored the measure in the House, have expressed confidence in pursuing legal avenues to ensure compliance. Meanwhile, Democratic Senator Tim Kaine highlighted the constitutional duty of Congress to oversee military engagements, framing the resolution as a necessary assertion of legislative power. With the outcome of the midterm elections looming, the resolution could further complicate the political calculus for both parties, potentially influencing the direction of U.S. foreign policy in the months ahead.