Trump Withdraws U.S. from Iran Nuclear Deal Against Unanimous Advice of His Own Cabinet

What He Did

On May 8, 2018, standing in the Diplomatic Reception Room of the White House, Donald Trump announced that the United States was withdrawing from the Joint Comprehensive Plan of Action — the multilateral nuclear agreement negotiated in 2015 between Iran, the United States, the United Kingdom, France, Germany, Russia, China, and the European Union. After his remarks, he signed a presidential memorandum reimposing “the highest level” of U.S. sanctions on Iran.

He called the JCPOA “a horrible one-sided deal that should have never, ever have been made.” He did not, then or later, articulate any specific provision Iran was violating. He could not, because Iran was not violating any.

Iran Was Complying — and Everyone Around Him Knew It

In April 2018 — three weeks before the withdrawal — the U.S. State Department’s own official report on the agreement concluded that Iran was “transparently, verifiably, and fully implementing the JCPOA” and reported “no material breach.” The International Atomic Energy Agency, which had inspectors on the ground at every declared Iranian nuclear facility, had issued more than a dozen reports between 2016 and 2018 finding no substantive violations. Director of National Intelligence James Clapper had testified that the JCPOA “puts U.S. in a far better place in terms of insight and access” than no agreement at all.

Inside Trump’s own cabinet, the picture was the same. Defense Secretary James Mattis told Congress on the record that “if we can confirm that Iran is living by the agreement, if we can determine that this is in our best interest, then clearly, we should stay with it.” Secretary of State Rex Tillerson and National Security Adviser H.R. McMaster delivered the same assessment to Trump’s face in the Situation Room: the agreement was working, the United States benefited, the country should remain a party.

Trump, by multiple contemporaneous accounts, “had a bit of a meltdown” when his own foreign policy team told him this. Tillerson was fired in March 2018, McMaster in April. Mattis was simply cut out of the final decision. With the dissenters silenced, demoted, or excluded, the policy came out the way Trump wanted: the United States walked away from a working arms control regime for no factual reason whatsoever.

Why This Mattered Then

The JCPOA had limited Iran’s stockpile of enriched uranium, capped its enrichment level at 3.67 percent (well below weapons-grade), required it to dismantle centrifuges, and subjected its nuclear facilities to the most intrusive inspection regime ever imposed on a sovereign state. In exchange, the international community lifted certain sanctions.

By withdrawing, the United States — not Iran — broke the deal. The other parties to the agreement publicly condemned the move. Britain, France, and Germany announced they would try to keep the deal alive without Washington. They could not. U.S. secondary sanctions, which apply to foreign companies doing business with Iran, made compliance impossible for European firms. The agreement effectively died.

Iran, freed from constraints it had been honoring, restarted enrichment. By 2019 it was enriching beyond the 3.67 percent cap. By 2020 it was enriching at 4.5 percent, then 20 percent, then 60 percent. Inspector access shrank. The breakout time to a bomb — the very thing the deal had been designed to extend — collapsed back toward where it had been before 2015.

Why This Matters Now

In February 2026, Trump authorized “Operation Epic Fury,” a joint U.S.-Israeli military strike that killed Iranian Supreme Leader Ali Khamenei and ignited a war that, as of May 2026, has dragged past its initially projected six-week timeline. By the time of the strike, Iran was a far more advanced nuclear threshold state than it had been in 2015 — closer to a bomb, with less international oversight, in part because of the decision documented here.

The straight line is hard to miss. In 2015, the United States and its partners had negotiated a verified halt to Iran’s nuclear program. In 2018, Trump tore that up against the unanimous advice of his own intelligence community and military leadership. In 2026, the same president who created the conditions for Iran’s nuclear breakout launched a war ostensibly to stop it. The crisis he is now selling as the justification for an open-ended military campaign is the crisis he chose to create.

It is the defining authoritarian move: manufacture the emergency, then claim emergency powers to address it. The Iran deal withdrawal was the first major foreign policy decision of his presidency made in defiance of every relevant expert in the U.S. government. It set the template for every one that followed.