What is there left to know about Donald Trump? Robert Mueller, various state officials, and a legion of reporters around the country are dedicated to penetrating any stubborn mysteries that still linger, yet who can argue that there is insufficient evidence to make a rational judgment about the character of the man, the nature of his Presidency, and the climate he has done so much to create and befoul?
Last week, with the midterm elections fast approaching, law-enforcement agents pored over an accumulating pile of crude explosive devices that had been sent to some of the President’s most prominent critics: Barack Obama, Hillary Clinton, Joe Biden, Eric Holder, Maxine Waters, George Soros, Robert De Niro, Tom Steyer, Cory Booker, Kamala Harris, and, at the CNN offices in New York, John…