They delegate to the locals...but they're in charge. And they left an open rooftop (with a tiny pitch on it) within an easy rifle shot of the guy they're supposed to be protecting. - Dope

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Apart from who is hiding what or spinning the rooftop, there have been other reports of the assassin being noted as a person of interest (or some such) 3 hours before and that his picture was taken in possession of a range-finder. The question is who decided to go ahead and let Trump take the podium when this threat had not yet been run to ground.

Here are a couple of headlines but caution, neither are Fox News so they should be viewed with the usual skepticism

https://www.msn.com › en-us › news › crime › officer-reported-man-at-trump-rally-with-range-finder-30-mins-before-assassination-attempt-source › ar-BB1q2FnW
Officer reported man at Trump rally with range-finder 30 mins ... - MSN
A local law enforcement officer spotted a suspicious man carrying a range-finder "in or just-outside" the venue well before former President Donald Trump took the stage.

CBS News: CBS News | Breaking news, top stories & today's latest headlines › news › sniper-picture-trump-rally-shooter-rangefinder-assassination-attempt
Sniper took picture of Trump rally shooter, saw him use rangefinder ...
1 day ago A sniper from a local tactical team deployed to assist the U.S. Secret Service at former President Donald Trump's rally on Saturday took a picture of the gunman and saw him looking through...