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.

The administration quickly appealed that order, citing a shooting incident at the White House Correspondents’ Dinner as evidence that the 90,000-square-foot ballroom is a security necessity.

Trump, meanwhile, harshly criticized Leon, calling him an “out of control Trump hating” judge whose ruling “severely jeopardizes the lives and welfare of the people who work, and will be working, at the White House.”

The administration said in Supreme Court filings last week that construction on the ballroom is already 65% complete as a 250-person crew is working on it nearly 24 hours per day.

Leon’s ruling would “halt the ongoing construction of the integrated military complex, including a totally secure ballroom space, at the East Wing of the White House, which is vitally required by national security,” U.S. Solicitor General D. John Sauer argued, while also claiming the group does not have standing to sue.

The National Trust, meanwhile, contended the administration is illegally trying to complete construction as soon as possible in a bid to “outrun judicial review” and push the project “beyond the point of no return.”

But its efforts “to foil judicial review and arrogate Congress’s exclusive powers should not be rewarded with a stay that allows [it] to complete a ballroom [it] lacked any authority to commence in the first place,” the Trust argued.