Article continues below advertisementA UFC fight at the White House sounds like a spectacle straight out of Hollywood, but it would require one of the most complex security operations ever attempted for a live sporting event.President Donald Trump has already begun hyping the June 14 event, timed to coincide with Flag Day and his birthday, calling it "the greatest show on Earth." Fighters Ilia Topuria, Justin Gaethje, Alex Pereira and Ciryl Gane visited the Oval Office Wednesday to celebrate what will be a first-of-its-kind matchup on the South Lawn.