Former Attorney General William Barr spent almost two years running interference for a dangerously unfit president. Now, in a brazen but not terribly persuasive attempt to clean up his image in history, Barr warns that his ex-boss, Donald Trump, didn’t belong in the White House and shouldn’t be invited back. “Trump cared only about one thing: himself,” Barr writes in his new memoir. “Country and principle took second place.” How curious that Barr says he only discovered this plain-as-day fact late in his tenure — because to a great many Americans, it was horrifically obvious the whole time Bar...