What Just Happened
On May 19, 2026, the Senate advanced a war powers resolution to halt military action in Iran by a 50-47 vote. Four Republicans defected: Sen. Bill Cassidy of Louisiana broke with his party for the first time on war powers. Sen. Tim Kaine of Virginia is the lead sponsor.
The House had a companion resolution scheduled. GOP leadership pulled it when whip counts showed they did not have the votes to defeat it. The vote has been delayed into June.
This is the closest Congress has come to restraining unilateral military action since the conflict began.
50-47. The closest the Senate had come to restraining the war. Four Republicans crossed over.
The 60-Day Clock That Ran Out
The War Powers Resolution lets a president send forces into hostilities for 60 days without congressional approval. After that, Congress must authorize the action or the troops must withdraw. The clock started on March 2, 2026, when the administration notified Congress of military action against Iran, and it expired on May 1.
The administration argues the deadline no longer applies, because a ceasefire halted hostilities before the 60 days ran out, even as U.S. naval ships kept patrolling the Strait of Hormuz. Secretary of State Marco Rubio told reporters the War Powers Act is unconstitutional, and that every president since 1973 has taken the same position.
The Constitutional Question
Congress passed the War Powers Resolution in 1973 over President Nixon’s veto, built to prevent exactly this standoff. No president since has accepted that it binds them. By late June, both the House and Senate had passed the resolution, the first time both chambers have done so since 1973. But a concurrent resolution like this one never goes to the president and carries no force of law.
So the question was never whether the law is clear. It is whether Congress will enforce it, and the 60-vote threshold in the Senate kept a majority’s objection from becoming binding action.
Cuba and Greenland Are Part of the Same Pattern
| Front | What happened | Congressional response |
|---|---|---|
| Iran | Active military operations | Senate advanced war powers resolution 50-47; House vote pulled |
| Cuba | U.S. claims Cuba bought 300 drones from Russia and Iran | Senate Republicans blocked Kaine’s war powers resolution |
| Greenland | Trump imposed tariffs to pressure Denmark into a sale | Murkowski and Shaheen introduced a separate war powers resolution |
Three fronts. One question: does Congress authorize military action, or does the president act alone? This is part of a broader fight over war powers and foreign policy that reaches beyond any single theater.
What You Can Do
- Send the Iran war powers letter on Resistbot asking Congress to enforce its constitutional authority over military action.
- Call your representatives and tell them both chambers passed the resolution but the administration is ignoring it. Ask them to oppose further funding for the Iran conflict until Congress votes on a binding authorization.
- If your senator is Bill Cassidy, Susan Collins, Lisa Murkowski, or Rand Paul, call and thank them. Bipartisan defections only hold if constituents reinforce them.
Update, June 3, 2026: The House voted 215 to 208 on Wednesday to pass a war powers resolution requiring President Trump to seek congressional approval or withdraw U.S. forces from the Iran conflict. Four Republicans crossed over to vote with Democrats: Thomas Massie of Kentucky, Brian Fitzpatrick of Pennsylvania, Warren Davidson of Ohio, and Tom Barrett of Michigan. The vote came nearly two weeks after House Republicans canceled an earlier scheduled vote, citing insufficient support to block the measure.
The resolution now moves to the Senate, which is required under the war powers law to take it up promptly. The 1973 War Powers Act mandates that a president seek congressional approval to continue military operations after 90 days of hostilities, a threshold the Iran conflict has now passed. The White House has contested that clock, pointing to a ceasefire in place since April 8 that U.S., Israeli, and Iranian forces have each violated on multiple occasions.
The 215-208 margin falls well short of the two-thirds majority required to override a presidential veto, limiting the resolution’s immediate binding force. House Democratic leaders Hakeem Jeffries of New York and Katherine Clark of Massachusetts issued a joint statement calling on Senate Republicans to act. This was the fourth House vote on a resolution to check Trump’s authority over the conflict, according to The Guardian.
Update, June 6, 2026: The House passed a War Powers Resolution on June 3 by a vote of 215-208, joining the Senate in formally challenging President Trump’s authority to continue military operations against Iran. Four Republicans — Reps. Thomas Massie of Kentucky, Tom Barrett of Michigan, Warren Davidson of Ohio, and Brian Fitzpatrick of Pennsylvania — voted with Democrats to support the measure. Trump responded the following day, calling the four Republicans “grandstanders” in a social media post.
The Senate still needs 60 votes to move to a final vote, requiring 10 additional supporters beyond the 50 who backed the May 19 procedural measure. Matthew Green, a political scientist at Catholic University, told PolitiFact that party loyalty gives Republican leaders strong incentive to block the resolution from advancing. No war powers resolution has ever cleared a presidential veto, which would require two-thirds majorities in both chambers.
The 60-day deadline under the War Powers Resolution passed May 1, but Trump declared military action “terminated” by citing a ceasefire, even as U.S. naval ships continued patrolling the Strait of Hormuz. Steven Smith, a political scientist at Arizona State University, noted that if Congress passes the resolution, Trump would have 30 days to remove forces absent a claim of self-defense. According to reporting by PolitiFact via PBS News, the administration would likely develop a legal rationale for noncompliance, pushing the matter toward the Supreme Court.
Update, June 23, 2026: The Senate voted 50-48 to pass a concurrent war powers resolution instructing President Trump to end U.S. military operations in Iran or seek congressional authorization to continue them, according to reporting by the BBC and PBS NewsHour. Four Republicans voted with Democrats in favor: Rand Paul, Lisa Murkowski, Susan Collins, and Bill Cassidy. Democratic Sen. John Fetterman was the only member of his party to vote against the measure.
The House passed the same resolution earlier in June, 215-208, with four Republicans joining every Democrat in support. The concurrent resolution does not go to the president for signature and carries no force of law, but its passage marks the first time both chambers have approved such a measure since the War Powers Resolution of 1973. A White House official told the BBC that the April 7 ceasefire left no active hostilities from which to withdraw U.S. forces, and noted that two Republican senators, Mitch McConnell and Dave McCormick, were absent for the vote.
On the same day as the Senate vote, the Pentagon asked Congress for $80 billion in supplemental funding, the bulk of it to cover costs from the Iran conflict. The U.S. and Iran are currently operating under a memorandum of understanding signed last week by both presidents, which sets a 60-day window to negotiate a broader agreement on Iran’s nuclear program. Sen. Thom Tillis, a retiring Republican from North Carolina, cited an estimated $100 billion already spent and 13 service members killed as reasons Congress should demand more than a return to pre-war nuclear limits.
Update, June 28, 2026: The Senate passed the war powers resolution 50-48 on June 24, with four Republicans crossing party lines: Bill Cassidy of Louisiana, Lisa Murkowski of Alaska, Susan Collins of Maine, and Rand Paul of Kentucky. The House had passed a companion measure on June 3 by a 215-208 vote. After Trump berated the four at a Capitol luncheon on June 25, Cassidy reversed his vote and Paul voted present on a near-identical resolution that same night, which failed 47-50.
The US military struck Iranian military sites on June 27 and June 28, citing an Iranian drone attack on a vessel in the Strait of Hormuz. Representative Ro Khanna of California called the strikes “a blatant violation” of the resolution and threatened to sue Trump. Iran responded by striking US military positions in Bahrain and Kuwait, putting the June 17 memorandum of understanding between the two governments at risk.
Constitutional lawyer Bruce Fein told Al Jazeera that courts would likely refuse to intervene under the political questions doctrine, leaving Congress the option of cutting off war funding. The Pentagon has separately requested an $80 billion supplemental from Congress, largely to replenish munitions depleted during the conflict.