When President Donald Trump accepted the Republican nomination for the White House for the third time, he told the crowd in Milwaukee, “I’m not supposed to be here.” It was a line he repeated often in the weeks following the attempt on his life in Butler, Pennsylvania, which happened just days before the GOP convention. The hardships Trump endured on his path to returning to the presidency weren’t limited to a pair of assassination attempts, jarring as those words are to write. He was indicted several times across multiple jurisdictions, convicted on 34 felony counts in his native New York, and subject to an FBI raid at his home in Mar-a-Lago. He faced civil action against his vast empire leading to a $454 million judgment against him. He had to appeal efforts to toss his...