That day was an American calamity.
Lawmakers huddled for safety. Vice President Mike Pence eluded a mob shouting that he should be hanged. Several people died during and after the riot, including one protester by gunshot and four police officers by suicide, and more than 140 officers were injured in a protracted melee that nearly upended what should have been the routine certification of the electoral victory of Mr. Trump’s opponent, Joseph R. Biden Jr...