Construction on the White House ballroom was ongoing on the South Lawn of the White House on Wednesday. The Supreme Court blocked a lower court injunction seeking a halt to continued work on the project on Friday. Photo by Al Drago/UPI | License Photo

Aug. 21 (UPI) -- The Supreme Court on Friday temporarily allowed construction on President Donald Trump's White House ballroom to continue, staying a lower court injunction demanding that it stop.

In a one-page order signed by Chief Justice John Roberts, the high court for now blocked an injunction issued in April by U.S. District Judge Richard Leon ruling that only that security-related, underground components of the $400 million project could move go ahead without congressional approval.

Leon's ruling found that construction at the White House requires authorization from Congress and ordered the construction to halt while a legal challenge brought by the National Trust for Historic Preservation plays out.

He carved out an exception for the government to continue underground work deemed necessary for the White House's safety and security.