Pennsylvania State Police identified Trump shooter as ‘suspicious’ before attack NBC NewsRooftop bodycam video shows confusion among officials, rifle shooter used in deadly attempt on Trump Fox NewsSecret Service director steps down after assassination attempt against ex-President Trump at rally The Associated PressHow the Trump Rally Gunman Had an Edge Over the Countersnipers The New York TimesGraphic video shows Thomas Crooks dead moments after Trump assassination attempt, confirms Secret Service was warned New York Post