Speaking to NowThis, Carnegie’s Jake Sullivan, one of the people who helped negotiate the Iran nuclear deal, argued that U.S. President Donald Trump’s decision to walk away from the deal was the biggest mistake of his presidency thus far. Sullivan explained that the nuclear deal was about simple questions: how does the West stop Iran from getting a nuclear weapon and how does the West prevent a nuclear arms race in the broader Middle East? Sullivan said that the answer to those questions is the Iran nuclear deal. Sullivan concluded that the chance of war is now much greater than before Trump took this decision.

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This interview was originally broadcast by NowThis.