Investigators looking into who purchased weapon in Trump rally shooting

Law enforcement officials identified Thomas Matthew Crooks as the shooter who opened fire at former President Donald Trump’s rally and whether he bought his weapon. NBC News’ Tom Winter reports on the latest in uncovering why Crooks carried out the attack. » Subscribe to NBC News: » Watch more NBC video: NBC News Digital is a collection of innovative and powerful news brands that deliver compelling, diverse and engaging news stories. NBC News Digital features , , , Nightly News, Meet the Press, Dateline, and the existing apps and digital extensions of these respective properties. We deliver the best in breaking news, live video coverage, original journalism and segments from your favorite NBC News Shows. Connect with NBC News Online! NBC News App: Breaking News Alerts: