 before answering, but would only say that he had an opinion, but he didn't have facts, so he was going to withhold further comment. He said he would get brief later tonight and might have more to say later. The FBI is investigating the incident as an assassination attempt, they say, on Trump. They have not released the gunman's identity nor stated a potential motive. The shooting took place while Trump spoke at a rally near Pittsburgh, a gunman opening fire from several hundred yards away on top of a rooftop, according to officials.