Trump shooter signed up online to attend rally a week before shooting: Source  ABC NewsTrump’s would-be assassin researched previous mass shooter Ethan Crumbley and his family before attack  CNNThomas Crooks appears to have posted ominous message before shooting  NBC NewsGunman’s Phone Had Details About Both Trump and Biden, F.B.I. Officials Say  The New York TimesFulton County DA Willis’ photo found on Thomas Matthew Crooks’ cell phone  FOX 5 Atlanta