A nonprofit organization seeking to halt construction of the planned ballroom at the White House pointed its latest court filing to what it called a “deficient” environmental review conducted by the Trump administration.

The National Trust for Historic Preservation filed a lawsuit earlier this month seeking to stop the demolition of the old East Wing of the executive mansion and the construction of the new ballroom in its place. The latest filing to the U.S. District Court for the District of Columbia takes aim at the environmental assessment, mandated under the National Environmental Policy Act, which was publicly released earlier this month.