It must again be emphasized: It is hard, if not impossible, to think of a more toxic allegation in American presidential history than the one leveled against candidate, and then president, Donald Trump that he “colluded” with the Kremlin in order to win the 2016 presidential election—and, still more, that Vladimir Putin’s regime, “America’s No. 1 threat,” had compromising material on Trump that made him its “puppet.” Or a more fraudulent accusation.