Trump is 'fine' after an assassination attempt at a Pennsylvania rally. The shooter, identified as Thomas Matthew Crooks, was killed.| USA TODAY
Law enforcement officials are working to learn more about Thomas Matthew Crooks, the 20-year-old who tried to assassinate former President Donald Trump at a rally in Butler, Pennsylvania, on Saturday.| AP News
Investigators hunt for clues about what may have driven the 20-year-old shooter to try to assassinate former President Donald Trump.| AP News