July 18, 2016 5:07 am Security on High Alert for RNC Kick Off This weekend’s fatal police ambush in Baton Rouge has placed a renewed focus on security at the Republican National Convention in Cleveland. NBC’s Tracie Potts reports. US & World Videos 1:45 NYPD enters Columbia University in riot gear to clear protest 4:28 ‘Apples Never Fall' and ‘Jurassic Park' star Sam Neill reveals his real name 3:21 Katy Perry's surprising regret about cheeseburger Met Gala look 1:01 Biden administration plans to reclassify marijuana as a Schedule III drug 2:28 King Charles returns to public duties amid cancer diagnosis