 When you're shooting with an AR-15. Moments before gunfire erupted at the Trump rally on Saturday, eyewitnesses saw Thomas Matthew Crooks, 20, climbing onto a roof with a rifle. And it looks like all kinds of people. I don't know. You know, I'm a professional with this. Let's have the investigation and see what happened. I know many people do work in law enforcement. We even had some of us under Secret Service people.