What began as a jubilant rally Saturday for Donald Trump days before he becomes the official Republican presidential nominee ended in mere minutes with the former president bloodied and a suspected would-be assassin shot dead by Secret Service.

The attack on Trump is antithetical to America, The Times’s editorial board writes. “The darkest hours of American history, the ones shadowed by political violence, remind us that incitement and hatred must be constantly challenged,” the Washington Post editorial board writes.

Secret Service agents shot dead Thomas Matthew Crooks, as he lay on a roof with a rifle outside the rally venue in Butler, Pennsylvania, the FBI said.