 In CN News, I'm John Champion. The FBI and Secret Service are investigating the possible motive of the gunman who opened fire during former President Donald Trump's rally Saturday, grazing the former president's ear. Meantime, in Milwaukee, where the Republican National Convention is being held, security is high. Here's the very latest from CBS News. I'm Matt Piper in Milwaukee. The U.S. Secret Service says despite what happened in Pennsylvania, nothing has changed on their end here at the RNC.