President Donald Trump pulling the U.S. out of the Iran nuclear deal flies in the face of hundreds of inspections that showed Iran was meeting its end of the bargain.

It’s a move that many leaders in the international community opposed, including all other parties to the deal – France, Germany, the U.K., Russia and China. Trump’s decision has generated a firestorm of commentary about what may come next.

But what stands out to me as a researcher on energy policy and nuclear policy, is what it says about the agency that carried out the inspections – the International Atomic Energy Agency – and its mission.

Inspections in Iran

In July 2015, after the Iran deal was signed, the United Nations Security Council adopted a resolution that requested the IAEA carry out the monitoring and verifying of Iran’s compliance with its nuclear commitments. Between January 2016 and February 2018, the agency conducted more than 400 site visits and dozens of unannounced, or “snap” inspections. It installed cameras and employed satellites to perform surveillance work.

The visits covered more than 190 buildings, and the agency’s investigations used hundreds of thousands of images. From this extensive activity, the IAEA repeatedly declared, up through the most recent director’s report of March 2018, that Iran was in compliance.

None of this is affected in the least by Israeli Prime Minister Benjamin Netanyahu’s recent presentation about Iran’s nuclear program, which was based on information dating from well before the Iran deal was even conceived.

And yet, Trump referenced the Israeli intelligence documents as “definitive proof that this Iranian promise was a lie,” in his speech announcing the U.S. was leaving the agreement.

By pulling out of the deal, Trump discounts the IAEA’s findings and signals to the world that he has little faith in it. As I see it, he is effectively saying it cannot be trusted to perform its most critical work in nuclear security.

Further, Trump’s action suggests that officials and intelligence agencies of all other parties to the Iran deal are gullible. Trump’s position is ironic, given that the IAEA was an invention of the U.S. It is not, however, unprecedented.

US commitment to nuclear security

In 2002, the Bush administration claimed Iraq was building a nuclear arsenal. They stated that the results of IAEA inspections, which indicated no evidence of weapons, could not be trusted. History has since shown the Bush administration was wrong about the accuracy of the IAEA’s work.

What, in the end, may really stick is the repeated example of U.S. leaders invalidating a crucial instrument for preventing the spread of nuclear weapons. I would argue that Trump has deepened the world’s dangers two-fold, by walking away from a successful nuclear deal and by showing a lack of respect for a key aspect of the IAEA’s mission to stop the spread of nuclear weapons around the world.

Scott L. Montgomery does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.