On Monday morning, Americans heard from former members of Donald Trump’s campaign and presidential administration who described unsuccessful efforts to disabuse him of various false claims about the 2020 election. Those tuning in to the hearing of the House select committee investigating the Capitol riot learned how people like former attorney general William P. Barr tried to explain to Trump that he was wrong in his assertions about rampant election fraud, with Trump simply choosing to press forward with false claims anyway. Then, on Monday afternoon, Trump pressed forward with false claims anyway. The former president released a 12-page document...