Trump weighs signing Iran 60-day ceasefire MOU without Senate vote

US and Iranian negotiators reached a tentative 60-day MOU on May 28, 2026, extending the ceasefireCeasefireA formal or informal agreement between warring parties to stop fighting, typically to allow negotiations, humanitarian access, or de-escalation.Key ConceptCeasefireA formal or informal agreement between warring parties to stop fighting, typically to allow negotiations, humanitarian access, or de-escalation.Open conceptBookmark and launching nuclear talks. The deal required Trump's final sign-off before taking effect. Trump convened a Situation Room meeting on May 29 to make what he called a 'final determination,' then left without announcing a decision.

The specific terms negotiators agreed to: Iran commits not to pursue a nuclear weapon; the Strait of Hormuz reopens immediately to unrestricted shipping with no tolls; Iran removes all sea mines within 30 days; the first 60-day negotiating agenda covers how to dispose of Iran's stockpile of highly enriched uranium; the US issues sanctions waivers letting Iran sell oil freely.

Trump posted on Truth Social on May 29 that 'other items, of far less importance, have been agreed to,' but listed conditions he insisted Iran 'must agree' to — including immediate Hormuz access and permanent non-pursuit of nuclear weapons. Iran's state outlet Fars responded that Trump's post 'raised issues that contradict the provisions of the agreement's text.' White House Deputy Chief of Staff Stephen Miller told Fox News that Iran had made 'significant, material, dramatic concessions' including a 'complete reopening of the strait,' but added 'nothing's final until it's final.'

VP JD Vance said on May 29 that the US and Iran were 'going back and forth on a couple of language points' and that 'it's hard to say exactly when, or if, the president's going to sign the MOU.' That single sentence captured a reality that stretched from the negotiating table to the constitutional order: the decision was entirely Trump's to make.

The agreement is structured as a memorandum of understanding — an executive agreementExecutive AgreementA binding international agreement made by the President without Senate approval, as opposed to formal treaties.Key ConceptExecutive AgreementA binding international agreement made by the President without Senate approval, as opposed to formal treaties.Open conceptBookmark — rather than a formal treaty. Under Article II, Section 2 of the Constitution, treaties require a two-thirds Senate vote to ratify. Executive agreements require no congressional vote at all. Presidents have used executive agreements to handle international commitments since the early republic, and they outnumber treaties by a ratio of roughly ten-to-one in modern US diplomacy.

The Obama administration used the same mechanism for the 2015 Iran nuclear deal — the JCPOA — which Trump withdrew from in 2018 without congressional approval. That exit was legally straightforward precisely because executive agreements, unlike treaties, can be undone unilaterally. The 2026 MOU follows the same legal structure: no Senate ratification needed, no treaty process, no legislative vote on whether to accept peace terms.

Operation Epic Fury — the name the Pentagon assigned to the Iran air campaign — was never authorized by Congress. The president launched it under his commander-in-chief power and continued it for more than two months. The Pentagon publicly placed the cost at $25 billion in congressional testimony; CBS News reported that internal assessments put the true figure closer to $50 billion. Thirteen US service members were killed and more than 400 wounded in the operation.

Under the War Powers ResolutionWar Powers ResolutionA 1973 statute requiring the President to notify Congress of troop deployments and limiting combat operations to 60 days without congressional authorization.Key ConceptWar Powers ResolutionA 1973 statute requiring the President to notify Congress of troop deployments and limiting combat operations to 60 days without congressional authorization.Open conceptBookmark of 1973, the president must notify Congress within 48 hours of deploying forces and must end unauthorized combat within 60 days unless Congress authorizes it or extends the deadline. The 60-day clock had elapsed. Congress had not authorized the war.

The Senate voted 50-47 on May 19, 2026 to advance a War Powers Resolution that would force Trump to end the Iran conflict. Four Republicans — Susan Collins of Maine, Lisa Murkowski of Alaska, Rand Paul of Kentucky, and Bill Cassidy of Louisiana — joined the Democratic caucus to break a previously unbroken wall of Republican opposition. It was the eighth time the Senate had voted on a WPR motion related to Iran; it was the first time one advanced.

But the House never voted. Republican leaders canceled the scheduled vote on May 21 — the same day a bipartisan majority was expected to pass it — rather than allow Trump a formal legislative rebuke. GOP leaders pulled the measure from the floor as it became clear Democrats had enough Republican crossover votes to pass it. Without the House passing an identical resolution, nothing reached the president's desk. The War Powers Resolution failed to deliver a check.

Iran hawks in Trump's own party warned him not to accept terms that left Iran's nuclear program intact. Sens. Lindsey Graham, Ted Cruz, Roger Wicker, and former Secretary of State Mike Pompeo argued publicly that the MOU effectively mirrored the Obama-era JCPOA — offering economic relief before securing permanent nuclear dismantlement. Pompeo told reporters the arrangement gave Iran 'cash and time' without forcing a fundamental change in its nuclear posture.

On May 14, 52 senators and 177 House members wrote to Trump demanding he reject any deal that allowed Iran to continue uranium enrichment. That letter had no legal force; it was a signal, not a constraint.

Defense Secretary Pete Hegseth issued a public warning on May 30 that the US military was 'more than capable' of resuming strikes if talks failed and was ready to resume combat in the Gulf if needed. He said he had spoken with Trump that morning and the administration was prepared to walk away from negotiations if Iran refused limits on its nuclear program.

IRGC adviser Mohsen Rezaei posted on X that Trump was 'betraying diplomacy for the third time' by continuing the naval blockade while demanding concessions. Rezaei warned that Iran would 'break the maritime blockade — either through negotiation or, if they resist, through direct action.' The blockade remained in place as of May 31.

The Strait of Hormuz is the world's most critical oil chokepoint. About 20.3 million barrels of petroleum pass through it daily, representing roughly a quarter of global seaborne oil trade. Saudi Arabia, Iraq, Kuwait, UAE, and Iran all route crude through the strait. About 89% of that crude goes to Asian markets; China alone accounts for 38% of total flows.

A closed or contested Strait of Hormuz raises oil prices globally. The MOU's promise of 'unrestricted' passage through the strait is therefore as much an economic policy decision as a military one: the beneficiaries extend from Houston refineries to Tokyo trading desks.

The families of the 13 US service members killed in Operation Epic Fury, and the more than 400 wounded, have no formal vote in whether the executive agreement ending the war is good enough. Congress — which under Article I holds the power to declare war — passed no declaration before the war started and was blocked from voting on a resolution to end it.

The constitutional arrangement on display in the Situation Room on May 29 was not an anomaly: it was the modern baseline. The president decides when wars begin and end. The mechanisms Congress created to reclaim that power — the War Powers Resolution, treaty ratificationTreaty RatificationThe Senate process of approving formal international agreements with a two-thirds vote.Key ConceptTreaty RatificationThe Senate process of approving formal international agreements with a two-thirds vote.Open conceptBookmark requirements — have both been routed around in this conflict.