The imprudence of unilateral US withdrawal from the Iran nuclear deal

The much-rumored and long-expected announcement by President Trump that he will order the United States to withdraw from the Iran nuclear deal—officially known as the Joint Comprehensive Plan of Action, or JCPOA­—is arguably the worst policy option for addressing problems in what was the least-bad possible deal when it was signed. Contrary to what candidate and then-President Trump often repeated (with his penchant for hyperbole), it was not the worst deal in history.