text:  Live from NPR News in Washington, I'm Nora Rahm. The FBI is spearheading the investigation into the shooting attack on former President Donald Trump overnight. The Bureau identified the suspected gunman as Thomas Matthew Crooks. NPR's Ryan Lucas reports. The FBI identified Crooks as a 20-year-old from Bethel Park, Pennsylvania, a town located about 40 miles from Butler, where the Trump rally was taking place.