 New information on the investigation into the attempted assassination of former President Trump. Authorities investigating whether the suspect, Thomas Matthew Crooks, used a drone to surveil the Pennsylvania rally site sometime before the shooting. ABC Chief Justice correspondent Pierre Thomas. After Crooks was killed, police finding his cell phone and a gray transmitter near his body, which authorities say Crooks intended to use to remotely set off explosives in his car. Sources say Crooks had information on his devices.