President Donald Trump urged supporters Thursday to respond peacefully to the killing of right-wing campaigner Charlie Kirk, as the murderer continued to evade a manhunt more than 24 hours after the shooting put an already divided U.S. on edge. Trump, who soon after the killing angrily pledged a wide-ranging response against the "radical left," told reporters that Kirk had been "an advocate of nonviolence." "That's the way I'd like to see people respond," he said. Kirk, a 31-year-old superstar on the Republican right who sparked surging youth support for Trump, was shot while addressing a large crowd at Utah Valley...