 There was a swarm of Secret Service officers that, you know, got on top of, knocked down President Trump and got on top of him. Mr. Trump was taken to a local hospital. The Trump team says he's okay. In the crowd, one person killed, two others critically injured. Overnight, the FBI identifying 20-year-old Matthew Crooks of Bethel Park, Pennsylvania, as the shooter apparently killed at the scene. ABC News investigative correspondent Aaron Katursky has the latest from law enforcement sources.