Former Secret Service agent questions why Trump was allowed on stage amid threat concerns: ‘Why not delay?’ Fox NewsSecret Service spotted Trump rally shooter on roof 20 minutes before gunfire erupted ABC NewsSecret Service was told local police couldn’t secure building used by shooter: Report The HillFormer Secret Service officials say agents should’ve kept Trump low, not fist pumping USA TODAYRetired Army captain at deadly Trump rally reveals ‘tactical reason’ Secret Service should’ve been on ARG roof Fox News