Two years ago, the United States joined our P5+1 allies to conclude the Joint Comprehensive Plan of Action: a landmark agreement that has prevented Iran from obtaining a nuclear weapon and made the American people and our allies safer. Thanks to the leadership of President Obama and the tireless work of scientists, diplomats, military leaders and other heads of state from all over the globe, the imminent and catastrophic threat of a nuclear-armed Iran was taken off the table – all without a shot fired.