Ultimately, 20-year-old gunman Thomas Matthew Crooks fired eight bullets at Trump from a rooftop during the rally, with a bullet grazing Trump’s ear.

“This is a very dangerous job, being president. They say a race car driver, 1% of 1% — think of that — die. It’s not a lot,” Trump said.

WASHINGTON -- One year ago, the attempted assassination of then-presidential candidate Donald Trump in Butler, Pennsylvania, marked a pivotal and deeply troubling moment for the nation-and especially for the U.S. Secret Service, the agency charged with protecting America's top leaders.