A federal lawsuit was filed seeking to block a planned UFC fighting event on the White House South Lawn, with legal challengers arguing the use of the historic grounds for a professional combat sports event should be stopped. The event is tied to a celebration of President Donald Trump's birthday.

The lawsuit represents an unusual legal challenge to a White House-sanctioned public event, raising questions about the appropriate use of the executive mansion's grounds for commercial or entertainment purposes. No court ruling had been issued at the time of initial reporting.

The UFC's planned presence at the White House reflects the close relationship between UFC President Dana White and President Trump, who has been a prominent ringside attendee at major UFC events. This would mark a first-of-its-kind event on the South Lawn if it proceeds as scheduled.

Details about who filed the lawsuit and the specific legal grounds cited were not fully disclosed in early reporting, though the challenge appears aimed at halting preparations before the event date. Legal experts have noted that challenges to presidential event planning face a high bar in federal court.