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US Senate joins House in voting to halt Iran war, rebuking Trump

Published by Global Banking & Finance Review

Posted on June 23, 2026

5 min read

· Last updated: June 23, 2026

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US Senate and House Vote to Halt Iran War, Marking Rare Bipartisan Rebuke of Trump

Congressional Action and Political Implications

By Patricia Zengerle

WASHINGTON, June 23 (Reuters) - The U.S. Senate backed legislation on Tuesday directing President Donald Trump to halt U.S. military action against Iran, the latest rebuke of the Republican president from an increasingly restive Congress.

The Senate voted 50-48 in favor of the war powers resolution, which passed the House of Representatives early this month, reflecting growing concern even among some of Trump's Republicans about the unpopular conflict that began on February 28.

It was the first time both chambers of Congress had passed a resolution directing a president to remove U.S. armed forces from hostilities since the War Powers Resolution,  more commonly known as the War Powers Act, was enacted in 1973. 

While likely to remain largely symbolic, the vote was a setback for Trump, who until recently had enjoyed near-unanimous support from Republican members of Congress.

It also comes as the administration is expected to ask Congress to authorize tens of billions of dollars to pay for the war.

Republican Party Divisions and Legislative Challenges

Trump's Republicans hold slim majorities in both the Senate and House, but a few have broken with the president on a handful of issues ahead of mid-term elections in November, which will determine whether the party will retain control of Congress.

Some Republicans recently balked at Trump's $1.8 billion "antiweaponization" fund to compensate political allies he says have been targeted by federal authorities and stalled a $70 billion bill to fund his immigration crackdown.

Public Opinion and Polling Data

Reuters/Ipsos poll results released on Tuesday showed that just one in four Americans believe the war with Iran was worth its costs, and a majority worry that a truce with Tehran is unlikely to last.

The Senate vote was largely along party lines, with four Republicans joining all but one Democrat in favor. Two Republican senators did not vote.

Constitutional Uncertainty and Legal Debate

War Powers Act and Executive Authority

Trump's administration is working to negotiate a peace agreement with Iran. Support for the resolution in Congress is likely to put pressure on the president not to resume hostilities, something he has suggested he might do if negotiations falter. 

Under the 1973 War Powers Act, the concurrent resolution - passed by both the House and Senate - does not go to the White House for Trump's signature. In the 1973 law, Congress intended such resolutions as a mechanism for ending military operations. 

But legal experts said the issue remains unsettled.  No war powers resolution had previously passed both chambers of Congress and a 1983 Supreme Court ruling said such a measure must be submitted for a president's signature or veto to have legal effect.

The White House has insisted the War Powers Act is not constitutional and thus not binding.

White House Response

On Tuesday, a White House official said the Senate vote has no significance because the resolutions do not go to the president and have no force of law and the measure passed only because two Republicans were absent.

The official also said the resolution directs Trump to remove U.S. forces from hostilities, which the White House says were terminated with a ceasefire on April 7.

Legal Experts' Perspectives

Experts say the constitutionality of the War Powers Act likely will be settled in the courts.

"The executive branch will likely ignore it on constitutional grounds, and it’s not clear who might have standing to sue to enforce it," said Scott Anderson, a senior fellow at the Brookings Institution and senior editor of the online legal publication Lawfare.

Congressional Intent and Constitutional Authority

Representative Gregory Meeks of New York, who sponsored the resolution in the House, said he viewed the resolution as binding and would pursue all legal avenues to ensure that the administration complies.

Democrats also noted that the U.S. Constitution gives Congress, not the president, the right to take the country to war. "Congress has to own this responsibility," Democratic Senator Tim Kaine of Virginia said in a speech urging support for the measure. 

Slim, But Significant, Support in Congress

House and Senate Voting Breakdown

The resolution had also passed the House with slim Republican support. The tally there was 215-208 with four Republicans and every Democrat voting in favor.

The four Republican senators who voted for the measure were Susan Collins of Maine, Rand Paul of Kentucky, Bill Cassidy of Louisiana and Lisa Murkowski of Alaska. Democratic Senator John Fetterman of Pennsylvania voted against it.

Republicans Mitch McConnell of Kentucky and David McCormick of Pennsylvania missed the vote.

Future Legislative Actions

Democratic lawmakers have promised additional votes on war powers measures, saying they want to force Republicans to go on the record about the war.

Congressional Oversight of Iran Peace Deal

Additionally, Congress has the right to review and vote on any peace agreement with Tehran if it affects Iran's nuclear program, under a 2015 law passed as then-President Barack Obama negotiated a nuclear agreement with Iran and other world powers.

Senate Republican Majority Leader John Thune of South Dakota said on Tuesday he expected Congress would review and vote on an eventual Iran peace deal.

(Reporting by Patricia Zengerle; additional reporting by Richard Cowan and Trevor Hunnicutt; Editing by Sanjeev Miglani and Don Durfee)

Key Takeaways

  • The Senate’s 50‑48 vote on June 23, 2026, mirrors the House’s June 3 approval (215‑208), signaling growing bipartisan unease within Congress over the Iran conflict and a notable shift among some Republicans. (elpais.com)
  • While symbolically significant, the resolution carries no legal weight under the War Powers Resolution—Congress cannot force withdrawal via concurrent resolution, especially in light of the 1983 Supreme Court precedent and the White House’s constitutional objections. (en.wikipedia.org)
  • This action reflects mounting legislative resistance to a war initiated on February 28. Previous attempts were repeatedly blocked, but momentum grew—mid‑June procedural votes showed narrowing margins, culminating in this rare congressional rebuke. (investing.com)

References

Frequently Asked Questions

What did the US Senate vote on regarding the Iran war?
The US Senate voted to direct President Trump to halt US military action against Iran.
What is the significance of the War Powers Resolution in this context?
The resolution is the first since 1973 to pass both chambers, aiming to remove US forces from hostilities.
Does the Senate vote have legal effect on the President?
The legal impact is unclear; experts say it may not be binding without the President's signature.
How did public opinion stand on the war with Iran?
A Reuters/Ipsos poll showed only one in four Americans believed the war was worth its costs.
What are the potential next steps following the Senate vote?
Pressure may increase on the President not to resume hostilities, and legal challenges could arise regarding the resolution's binding nature.

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