Senate Blocks Bid to Limit Trump's War Powers as US-Iran Peace Deal Nears

The United States Senate narrowly blocked a resolution to curtail President Donald Trump's war powers on Tuesday, giving the administration crucial breathing room as it finalizes a landmark peace framework with Iran.[1]

In a 47-to-48 vote, senators rejected a motion to discharge the resolution out of committee. The measure, spearheaded by Democratic Senator Raphael Warnock, would have directed the president to remove U.S. armed forces from hostilities against Iran unless explicitly authorized by a congressional declaration of war.[1]

The vote split largely along party lines, though four Republicans—Senators Susan Collins, Bill Cassidy, Lisa Murkowski, and Rand Paul—broke ranks to support the measure. Senator John Fetterman was the sole Democrat to oppose it.

The legislative clash comes just days after the U.S. and Iran announced a preliminary memorandum of understanding to halt the months-long conflict that began in late February. The agreement, brokered with Pakistan acting as a mediator, is slated for a formal signing ceremony in Geneva on Friday.

President Trump, currently attending the G7 summit in Évian, France, has touted the agreement as a historic breakthrough. A central pillar of the framework is the immediate reopening of the Strait of Hormuz, a critical global energy chokepoint, alongside the lifting of the U.S. naval blockade on Iranian ports.[3]

Global markets reacted swiftly to the de-escalation. Brent crude oil tumbled nearly 4 percent to drop below $80 a barrel for the first time since early March, reflecting widespread optimism that the disruption to 20 percent of the world's daily energy supply is coming to an end.

Despite the economic relief and the cessation of hostilities, lawmakers in Washington are expressing deep frustration over the secrecy surrounding the pact. The full text of the agreement has not been shared with Congress, leaving both Democrats and Republicans in the dark regarding the specific concessions being made to Tehran.[1][2]

Senate Majority Leader John Thune formally requested a briefing and the text of the agreement earlier on Tuesday. Meanwhile, Democratic Leader Chuck Schumer criticized the administration on the Senate floor, noting that the White House had yet to release any concrete details about the enforcement mechanisms.[2]

Vice President JD Vance defended the administration's approach, describing the framework as a "performance-based" deal. He indicated that sanctions relief would only follow rigorous verification that Iran is dismantling its stockpile of highly enriched uranium.

The interim agreement establishes a 60-day window for further negotiations on Iran's nuclear program and broader regional security. Analysts caution that while the immediate military threat has subsided, the lack of clarity on long-term enforcement leaves the deal vulnerable to collapse.[2]

For war powers advocates, the temporary truce does not erase the constitutional bypass that initiated the conflict. Senator Tim Kaine argued that an "intermission" in fighting is the exact moment Congress should assert its oversight role, rather than stepping back.[1]

Under the 2015 Iran Nuclear Agreement Review Act, any permanent deal altering sanctions related to Iran's nuclear program must eventually be submitted to Congress. As Friday's signing ceremony approaches, the administration faces the dual challenge of finalizing technical details with Tehran while navigating a skeptical legislature that holds the ultimate authority over permanent sanctions relief.[2]