The upper chamber voted 50 to 48 to approve the House-passed resolution, which was introduced by Rep Gregory Meeks, the top Democrat on the House Foreign Affairs Committee.
Republican Senators Bill Cassidy of Louisiana, Susan Collins of Maine, Lisa Murkowski of Alaska and Rand Paul of Kentucky joined Democrats in supporting the resolution.
Democratic Sen John Fetterman of Pennsylvania voted against it, while Republican Sens. Mitch McConnell of Kentucky and Dave McCormick of Pennsylvania did not vote.
The practical impact of the measure remains uncertain, as Washington and Tehran have already reached an interim peace agreement. However, the nonbinding resolution represents the strongest symbolic pushback from Capitol Hill against the war to date after nine previous votes failed to secure a simple majority needed to pass it in the Senate.
The Senate vote came less than a week after the Trump administration announced an interim understanding with Iran aimed at halting hostilities while negotiations towards a broader settlement continue.
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