Iran’s Nuclear Development Under Obama Deal: Trump’s Claims Examined

Iran Nuclear Deal Impact: Experts Dispute Trump’s Claims About Weapons Development

Former President Donald Trump has repeatedly claimed that the 2015 Iran nuclear deal would have enabled Iran to develop nuclear weapons by now if he hadn’t withdrawn the United States from the agreement in 2018. However, nuclear security experts dispute this assertion, arguing that Trump’s withdrawal actually accelerated Iran’s nuclear program rather than preventing weapons development.

“If I didn’t terminate that deal, they would be sitting with a massive nuclear weapon three years ago, which would have been used already on Israel at least, and other countries also,” Trump stated on March 3 while discussing U.S. airstrikes on Iran that began in February. He has made similar claims on multiple occasions, describing the Obama-era agreement as “a road to a nuclear weapon.”

The Joint Comprehensive Plan of Action (JCPOA), negotiated by the Obama administration and signed by the five permanent members of the UN Security Council plus Germany, imposed significant restrictions on Iran’s uranium enrichment capabilities. The agreement, which took effect in 2016, required international inspections of Iranian nuclear facilities in exchange for the lifting of economic sanctions.

Laura Rockwood, senior fellow at the Vienna Center for Disarmament and Non-Proliferation and former IAEA official, directly refuted Trump’s assertions. “Iran was able to advance its nuclear programme to the point where it was before the 12 Day War last June not because of the JCPOA, but because President Trump withdrew the United States from the JCPOA,” she explained.

Richard Nephew, an international affairs scholar at Columbia University who worked as a special envoy for Iran under the Biden administration, agreed: “Trump’s decision to withdraw from the JCPOA in 2018 had a significant accelerating effect on the program.”

Following the U.S. withdrawal in May 2018, Iran began exceeding the agreement’s limits. By July 2019, the International Atomic Energy Agency reported that Iran had surpassed the permitted stockpile of low-enriched uranium. Iran subsequently announced it would begin enriching uranium beyond the 3.67% level allowed under the deal.

“The JCPOA dramatically restricted Iran’s ability to produce fissile material,” Rockwood emphasized. “Iran simply would not have been able to enrich to the point of possessing over 400 kg of 60% enriched uranium had the JCPOA remained in place.” Weapons-grade uranium requires 90% enrichment.

The agreement included a comprehensive monitoring system designed to block Iran’s pathway to nuclear weapons for at least 15 years, with some provisions extending even longer. International inspectors would have maintained enhanced access indefinitely under the deal’s terms.

Critics of the JCPOA, including Trump, argued that the deal didn’t go far enough in restricting Iran’s activities. They particularly objected to the “sunset provisions” that would gradually lift certain restrictions, such as limits on centrifuges after 10 years and reduced enrichment beyond 3.67% after 15 years.

Trump may have been referencing “transition day,” which was scheduled for October 18, 2023—eight years after implementation—when some restrictions on Iran’s nuclear and missile programs would have been modified if Iran had complied with its commitments. However, countries remaining in the JCPOA after the U.S. withdrawal maintained their restrictions, citing Iran’s noncompliance.

The nonpartisan Center for Arms Control and Non-Proliferation estimates that Iran’s “breakout time”—the period needed to produce enough weapons-grade uranium for one bomb—increased from 2-3 months before the deal to over 12 months during the agreement. After the U.S. withdrawal, this timeline shortened dramatically to just weeks.

Producing an actual nuclear weapon would require additional steps beyond uranium enrichment. “After this point, once you have the weapons-grade uranium, Iran would then need to manufacture the rest of the weapon. This process would likely take much longer, perhaps months to a year,” explained Emma Sandifer, program coordinator at the Center for Arms Control and Non-Proliferation.

Before withdrawing from the deal, Trump had claimed Iran committed “multiple violations,” despite the IAEA consistently reporting compliance. In September 2017, then-Joint Chiefs Chairman General Joseph Dunford testified to Congress that “Iran is adhering to its JCPOA obligations” and that the agreement “has delayed Iran’s development of nuclear weapons.”

The impact of Trump’s withdrawal continues to shape regional security dynamics and international diplomacy efforts regarding Iran’s nuclear ambitions, with experts maintaining that the decision ultimately undermined rather than enhanced global nonproliferation goals.