“More than two years ago, soon after Donald Trump entered the presidential race, I noted online that no one like him—with no political, military, judicial, or public-service experience, with no known expertise on policy matters, with a trail of financial and personal complications—had ever before become president. Therefore, I said, it wasn’t going to happen this time. Quite obviously that was wrong. Penitent and determined to learn from my errors, I’ve avoided any predictions involving Trump and his circles ever since.”