But now we know:
-He scoped out the venue with a rangefinder
-They had him on their radar and knew he was there 3 hours in advance
-Witnesses saw him climb in the roof
-A cop called it in - Dope

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Plus this, an officer (local PD I think) associated with the protection detail for that metal building was commenting that the cop who climbed up and spotted the assassin and then fell back to the ground when the assassin pointed his rifle. He said that officer was immediately on the radio, on a standard emergency channel that everyone in the protection detail could monior, clearly stating an armed threat had been observed.

There must have been two or three secret service literally standing next to Trump and not one of them stopped the president and immediately evacuate him from the area. Or could have least said, Mr President we have a security situation that needs to be resolved, Please remain backstage until it is cleared.

I heard on the news today that it should not have taken two minutes to get Trump off that stage and into a vehicle. The report went on to say that the presidents car with him inside sat for another 2 minutes because the motorcade was not quite ready to leave.