What this all translates to is pretty piss poor security.
Via ABC:
As Hillary Clinton campaigned in Kissimmee, Florida on Monday evening, Seddique Mir Mateen, the father of Orlando nightclub shooter Omar Mateen, was seen sitting behind Clinton at her rally.
The presence of Seddique Mateen — whose controversial views on Afghan politics and homosexuality were made public in the aftermath of the June massacre at Pulse nightclub — and his proximity to a presidential candidate, raised eyebrows.
Seddique Mateen was seated in an area directly behind Clinton, within view of cameras broadcasting the event.
A U.S. Secret Service official declined to discuss Mateen specifically, but said that “the roughly 3,000 participants at the Clinton rally in Florida all received the exact same screening.”
Security at public campaign rallies includes metal detectors, but attendees are typically not required to undergo background checks or receive additional scrutiny unless they will be sitting within feet of the candidate. These seats are usually reserved for invited guests.
On Clinton’s campaign website, the only information requested in the RSVP for the Kissimmee rally was a first and last name, email address, phone number and ZIP code. An RSVP was not required for the event and it was unclear if Mateen RSVP’d.