 The Secret Service, along with the FBI, briefed lawmakers on 20-year-old shooter Thomas Matthew Crooks. A source directly familiar with the briefing tells CBS News Crooks used his phone to search for images of former President Trump and President Biden. Crooks also searched the names of FBI Director Christopher Wray and Attorney General Merrick Garland and looked up symptoms of depressive disorder. He visited the site of the attack at least once before the rally. Investigators have yet to discover a motive.