Shooter who targeted Trump used a semi-automatic rifle

NBC News’ Tom Winter reports on the shooter who targeted former President Trump with a semi-automatic rifle at his Pennsylvania rally and new security concerns after the assassination attempt. » 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: Visit : Find NBC Ne