Trump returns to Butler, Pennsylvania for a rally Saturday. Here's how Secret Service will secure the event.

When former president Donald Trump takes the stage once again Saturday in Butler, Pennsylvania, the security apparatus around the GOP nominee will look starkly different from the day of the first assassination attempt against him, when he took cover behind his podium as a gunman opened fire. 

U.S. Secret Service personnel will be stationed both inside and outside of the secure perimeter. That area includes the roof of a glass company warehouse where investigators say 20-year-old Thomas Crooks fired off eight rounds on July 13, grazing Trump's ear, killing one attendee and injuring two others.