President Donald Trump spent hours in front of a television at the White House watching the attack on the Capitol unfold on Jan. 6, 2021, ignoring pleas from staff, supporters and family to call off the rioters—and even at times encouraging them—according to testimony Thursday at a prime-time hearing of the House committee investigating the attack. “The case against Donald Trump, in these hearings, is not made by witnesses who are his political enemies,” said Rep. Liz Cheney (R., Wyo.), the committee’s vice chair, at the close of the hearing, the eighth and last of the current series. “It is...