Secret Service identified Thomas Crooks as a ‘threat’ 10 minutes before Trump took stage, but let him go on anyway New York Post Three days after attempted assassination, Trump shooter remains an elusive enigma The Associated Press19 lost minutes: Law enforcement failed to keep sight of Trump shooter, whose motive is still unclear to investigators CNNSecret Service was told police could not watch building used by Trump rally shooter The Washington PostTrump would-be assassin climbed air conditioning unit to access shooting perch: report Fox News