Why wasn't the rooftop where Thomas Crooks shot at Donald Trump secured? The Secret Service knew it was a risky spot days before the rally. Investigators are now questioning how the gunman got up there despite this knowledge. The Secret Service also blames local police, saying the roof was their responsibility. However, Butler County’s District Attorney insists the Secret Service was in charge of all security. Adding to the chaos, Trump's usual Secret Service detail was overworked and understaf...