Washington, Sept. 11 -- US President Donald Trump on Thursday (US local time) said investigators are making progress in tracking down the suspect behind the assassination of conservative activist Charlie Kirk, calling the killer "a total animal."

Trump told reporters he had spoken at length with Kirk's widow, Erika. "We had a long talk, and she's devastated. She's absolutely devastated, as you can imagine," he said.

When asked about a possible motive for the attack, Trump said he had "an indication" but declined to share details. "We'll let you know about that later," he added.

Kirk, 31, was shot in the neck on Wednesday while answering a question on mass shootings during an open debate at Utah Valley University, as per The New York Ti...