A federal judge clarified Thursday that his order halting construction of the White House ballroom only applies to above-ground construction, adding that below-ground construction of enhanced national security features for the complex may proceed.

U.S. District Judge Richard Leon, an appointee of former President George W. Bush, issued an opinion clarifying his order late last month to halt construction of the new White House East Wing, which includes the proposed ballroom that President Donald Trump has championed. The National Trust for Historic Preservation, which sued over the ballroom project, requested Leon clarify what construction was covered under his exception, allowing the continuation of construction deemed important to safety and security. The Justice Department had asked the judge to treat all construction, both above-ground and below-ground, as covered under the security exception. Leon flatly rejected the DOJ’s request.