Senate Republicans block war powers measure on Iran as GOP unease grows

# Senate Republicans block war powers measure on Iran as GOP unease grows

Standfirst: The Senate rejected a Democratic war powers resolution 49-50, but three Republicans joined Democrats in opposing the war and Lisa Murkowski broke with her party for the first time.

The U.S. Senate on 2026-05-13 again blocked Democratic legislation aimed at forcing President Donald Trump to end the war with Iran, but the vote also exposed growing unease inside the Republican Party over the conflict.

The measure failed 49-50, a result that kept the administration’s war policy intact for the moment. Yet the voting pattern was notable: Republican Sen. Lisa Murkowski of Alaska opposed the war for the first time since it began, joining Sens. Susan Collins of Maine and Rand Paul of Kentucky, who had already been voting against the conflict. Sen. John Fetterman of Pennsylvania was the only Democrat to oppose the resolution.

That narrow tally does not change the immediate outcome, but it does show that opposition inside the GOP is becoming more visible. Democratic Sen. Tim Kaine, who has led the repeated war powers push, said more senators were beginning to question the direction of the conflict. Republicans, for their part, remain in control of the chamber and were able to stop the resolution from advancing.

The White House has argued that it does not need congressional authorization to continue the campaign. According to the evidence packet, administration officials have said the war has been “terminated” because the United States has entered a ceasefire, even as U.S. military activity and regional tensions continue. Defense Secretary Pete Hegseth told lawmakers the administration believes it has “all the authorities necessary,” a position that underscores the constitutional dispute at the heart of the issue.

The Senate vote also reflects a political calculation. Several Republicans remain wary of the cost of the war, including its effect on gas prices and the possibility of deeper U.S. involvement. At the same time, leadership figures such as Sen. John Barrasso defended the conflict, arguing that Iran’s economy is under pressure and that Democratic efforts are aimed at undermining Trump. The result is a party split between loyalty to the president and concern about the war’s direction.

The vote would still face major obstacles even if it had passed. A war powers resolution would need to clear the House and survive a veto, which the evidence packet says would be highly unlikely. That makes the Senate fight partly symbolic, but symbols matter when lawmakers want to signal dissatisfaction with executive war-making.

For now, the verified picture is a narrow defeat for Democrats, a handful of Republican defections, and a Senate debate that suggests the war with Iran is beginning to generate more institutional resistance than it did at the start of the conflict.