 And of all the rooftops, this is the one that most needed to be secured, but it wasn't. Apparently, there was just one police officer who responded in a meaningful way during this whole process before the shooting started. According to Associated Press, the local police officer heard all these people yelling about someone on the roof. Reportedly, the officer climbed up on the roof, at which point the gunman pointed his rifle at him. The officer dropped back down, retreated, and the gunman quickly began firing at Trump. Now, it's not clear why the officer didn't alert Secret Service or why he didn't engage the shooter immediately, which is what he should have done.