Time Magazine called Lt. Gen. H.R. McMaster a “pre-eminent warrior-thinker.” President Donald Trump called him a pain. So when McMaster left the White House to be replaced by the hawkish Ambassador John Bolton, foreign policy experts saw the writing on the wall. The Iran nuclear deal was next on the chopping block. On this bonus episode from The World’s partners at the podcast, Things That Go Boom, host Laicie Heeley tracks how advisers clashed right up to the moment Trump yanked the United States out of the deal. Others seemed intent on pressuring Iran to a breaking point. Was Trump right to walk away? Or was there something else — something more political — motivating the president’s decision?