Eight years ago, when Donald Trump romped to victory in New Hampshire’s Republican presidential primary, his critics within the party could be forgiven for not knowing what to do about him. Though Trump had been a mainstay of right-wing cable news for years, he was a political neophyte. But this much was clear: He was unapologetically not a traditional conservative—indeed, he had long been a Democrat—and he took particular glee in spitting in the face of the GOP establishment. So his rivals for