 Investigators are looking into whether the shooter used a drone to surveil the rally site sometime before the shooting. We are also learning it's possible the attack could have been thwarted as late as six minutes before the first shot was fired. Despite wars raging overseas, a top White House official saying on Friday that there are no specific threats to the U.S. amid election year concerns. National Security Advisor Jake Sullivan speaking about this at the Aspen Security Forum in Colorado.