And sources also said there were also concerns that some of those officers should have been available to help with the First Lady’s visit to Pittsburgh at the same time.

Sources said cycle units from nearby universities had to be called in to assist Pittsburgh Police with Jill Biden’s motorcade.

I haven't seen anyone else speculate (not that I'm claiming some novel theory) that Jill Biden's simultaneous Pittsburgh event was designed specifically to direct as many protection resources away from Trump as possible.