The U.S. Supreme Court is set to wade into a long-running battle between developers of a 605-mile (975-kilometer) natural gas pipeline and environmental groups who oppose the pipeline crossing the storied Appalachian Trail.

On Monday, the high court will hear arguments  on a critical permit needed by developers of the Atlantic Coast Pipeline.

Backed by the Trump administration, project developers Dominion Energy and Duke Energy will ask the high court to overturn a lower court that threw out a permit for the pipeline to cross two national forests, including parts of the Appalachian Trail, the historic footpath that stretches from Georgia to Maine.

The question before the Supreme Court is whether the Forest Service has the authority to grant rights-of-way through lands crossed by the Appalachian Trail within national forests.

Lawyers for Dominion and U.S. Solicitor General Noel Francisco argue in legal briefs that the U.S. Forest Service has jurisdiction over land in the George Washington National Forest, where a 0.1-mile segment of the pipeline would cross about 700 feet (215 meters) beneath the Appalachian Trail.

But the Sierra Club and other environmental groups say that because the 2,200-mile (3,540-kilometer) scenic trail is considered a unit of the National Park System, no federal agency can grant a right-of-way for the pipeline. They say only Congress can approve such a crossing.