 Secret Service officials say they have turned down requests over the past two years, but did not turn down any requests related to the rally in Pennsylvania. A reversal from earlier statements. That interview will air on Monday night. CBS's Caitlin Huey Burns reports that investigators are learning more about what the believed shooter in last week's attempt on Trump's life did in the days before the shooting. CBS News has learned from law enforcement sources that the gunman flew a drone near the area around the rally site days before the event began.