Earlier, the former US Secretary of State said that President Trumps decision in May to leave the 2015 Iran nuclear deal weakens our security, breaks Americas word [and] isolates us from our European allies. In an interview with CBS Face the Nation, former US Secretary of State John Kerry berated President Donald Trump for having described the Iran nuclear accord, or the Joint Comprehensive Plan of Action (JCPOA) as the worst deal ever. Unfortunately and I say this sadly more often than not, he really just doesnt know what hes talking about.