WATCH LIVE: Obama addresses extremism at White House summit

February 18, 2015       BREAKING NEWS WATCH LIVE: Obama addresses extremism at White House summit This is a developing story and we expect to have more information soon. Go toNBCNews.com for further developments.     Keep Reading             For Breaking News, the moment it happens, follow @NBCNEWS Follow @NBCNEWS     More Top Stories     Afroman Arrested for Punching Female Fan at Concert > Son Was in Gunfight When Mom Shot Over Road Rage > Here's Why Pot Gives People the Munchies > Watch Monkeys Play Games on iPads at Minnesota Zoo > Obama Names New Head of Secret Service >