A federal lawsuit filed Saturday aims to prevent a Ultimate Fighting Championship event scheduled for June 14 on the White House South Lawn, which is planned to coincide with President Donald Trump's 80th birthday and the nation's 250th anniversary celebrations.

The Public Integrity Project filed the lawsuit on behalf of two Virginia residents, challenging the Trump administration's authorization of the mixed martial arts event. The plaintiffs argue the approval violated National Park Service regulations that prohibit sporting events on federal parklands.

The lawsuit also contends that Congress did not consent to the construction of a towering arch overlooking the event space and that no environmental review was conducted before construction began. Crews are currently erecting an octagon-shaped cage on the South Lawn as part of the preparations.

Trump has described the project as featuring "a 5,000-seat arena right outside the front door of the White House." The UFC plans to install additional large screens at the nearby Ellipse park and distribute up to 85,000 free tickets to accommodate spectators at both locations.

The White House responded to the legal challenge in a statement, calling it "an obstructionist, baseless, and dilatory" attempt to prevent the event. Officials said the UFC fight was "no different than the various other White House-hosted events on the South Lawn and properly permitted events on the Ellipse and National Mall throughout the year."

The octagon and surrounding structures represent part of what has been characterized as a White House building boom under the Trump administration. UFC representatives did not immediately respond to requests for comment about the lawsuit.