 That would have been the end of it. Anybody watching this would be assassin, would have immediately noticed when he scaled the building, armed with a rifle, and Trump would have been taken to safety right away. Apparently, though, the police and Secret Service lost track of the assailant. But dozens of bystanders saw what he was doing anyway, and they alerted the police, including a police officer who was right in front of the roof where the shooter was perched.