Federal investigators probe whether Trump shooter Thomas Matthew Crooks flew drone over rally site  Fox NewsGunman in Trump rally attack flew drone over rally site in advance of event, official says  The Associated PressInvestigators believe Trump’s would-be assassin flew a drone over rally site on the day of the shooting  CNNGunman at Trump rally flew drone over fairgrounds earlier on day of shootings  The Guardian USTrump rally shooter’s duffel bag and range finder first sparked suspicions, sources say  ABC News