The US Senate has blocked a resolution that would have forbidden President Donald Trump from waging war against Iran without Congressional approval. A similar resolution passed the House of Representatives hours earlier.

The Senate defeated the resolution in a 49-47 vote on Thursday, with Democrat Senator John Fetterman joining his Republican colleagues to oppose it, and Republican Senator Susan Collins lending her support to the measure.

Republican Senator Rand Paul and Lisa Murkowski (R-Alaska), who had backed previous resolutions aimed at reining in Trump’s war powers, missed the vote. “The Iran war has not been a success,” Paul told reporters on Wednesday. “I think by any objective measure we’re worse off than we were before the war.”

A similar resolution was passed by the House of Representatives earlier on Thursday, with four Republicans breaking ranks to squeeze the measure through in a 214-208 vote. However, the resolution lacked any legal power, and was described by its author, Representative Pramila Jayapal, as a “vote of conscience.”

The US and Iran have traded tit-for-tat strikes over the last 12 days, after the collapse of a temporary ceasefire earlier this month. After the US launched a series of airstrikes during the funeral period for slain Iranian Supreme Leader Ali Khamenei, Iran responded by closing the Strait of Hormuz and targeting US bases in multiple Gulf states – including Bahrain, Kuwait, and the UAE – and in Jordan.

Four Americans have been killed since hostilities resumed, three in Jordan and one in Iraq, according to the US authorities. The New York Times has accused the Pentagon of withholding information on dozens of service members injured in separate Iranian strikes last week.

Egyptian, Pakistani, and Qatari mediators are reportedly urging Washington and Tehran to agree to a new ten-day ceasefire and sit down for talks aimed at salvaging the previous deal. However, Trump has described talks as “a waste of time,” and on Thursday, the president told Axios that he is “considering a massive attack” on Iran, “bigger than ever before.”

With Yemen’s Houthis now targeting shipping in the Red Sea, and with Trump claiming that Israel would rejoin the war “in two minutes if I ask them to,” Russia has called on all sides to de-escalate.

In a statement on Thursday, Russian Foreign Ministry spokeswoman Maria Zakharova urged “all sides in the conflict to demonstrate a responsible approach and restraint and to refrain from any actions that could expand the geography of military confrontation and lead to the further deterioration of the military-political situation in the Middle East.”