 Apparently, all of these reports prompted some police officers to call for backup and try to scale the roof to stop the shooter. But they obviously failed to do so. The gunman climbed on top of the building using an air conditioning unit, not a ladder, as previously reported, and fired several shots at Trump before he was taken out. So what explains why Donald Trump wasn't taken off the stage at any point in this process until a gunman had already shot him in the head? Because even if you want to claim that for some reason they couldn't confront the suspect right away or which