 The FBI acknowledges it is still trying to figure out the motive behind this attempted assassination, and they have the shooter's phone at their FBI lab in Quantico. Secret Service, whose sniper shot and killed the gunman, is also in charge of security at the GOP convention. Retired agent Robert McDonald. The Secret Service, based upon the events over the weekend, is going to double and triple check, tighten up, and make sure that everything is squared away. President Biden spoke from the Oval Office last night. You know, the political record in this country