President Donald Trump’s administration is facing a legal fight over soil dumped at a public golf course in Washington, D.C., after National Park Service testing found the dirt contained arsenic and lead, according to reporting by The Wall Street Journal.

The dispute centers on East Potomac Golf Links, where the administration plans to build a major golf championships facility. The Journal reported that the course has been topped with dirt from demolition work at the East Wing, where Trump wants to build a ballroom.

Because the project involves a public course overseen through the federal park system, the fight is not only about the golf facility itself but also about how demolition material is handled on land used by residents and visitors. The soil-testing dispute has become a key issue in the broader challenge to the work.

Opponents of the project, led by the D.C. Preservation League, are suing the Department of the Interior in an effort to stop the work, according to NBC News. They argue that soil placed on the links by the Trump administration could harm golfers and the environment, the Journal reported.

The National Park Service tested the dirt and found no asbestos, but the testing indicated the presence of toxins including arsenic and lead, according to the Journal. The D.C. Preservation League is now asking a federal judge to allow it to conduct its own testing of the soil.

During a hearing this month, U.S. District Judge Ana Reyes questioned why the Trump administration would not permit additional testing.

"If there isn't a problem with it, who cares?" Reyes asked. The judge reportedly added that "there appears to be a lot of arsenic in the soil 'and that seems like a bad thing.'"