[The_Media_never_lie]

Why was Trump on stage while this was going on?

[thefactor]

Because the lead USSS agent on the scene screwed up royally. He is the supreme ruler of the venue. Either he didn't get the info or he didn't get the full picture of what was happening.

Like I said, it was a total F-up. Take the local cop who went up the ladder and allegedly saw the shooter. If he knew 100% that was an assassin I think he would have sounded the alarm. But if there's even 1% of doubt in your mind, you're going to convince yourself not to shoot because of what can happen if you're wrong.