It didn't begin with Donald Trump. The unraveling of the Grand Old Party has been decades in the making. Since the time of FDR, the Republican Party has been home to conspiracy thinking, including a belief that lost elections were rigged. And when Republicans later won the White House, the party elevated their presidents to heroic status--a predisposition that eventually posed a threat to democracy. Building on his esteemed 2016 book, What Happened...