WASHINGTON — The Supreme Court was urged Tuesday to block construction of President Trump’s huge new ballroom until Congress weighs in. A decision, perhaps only temporary, is likely by Friday.

Acting on his own, Trump had the East Wing of the White House torn down in October and ordered work to start on a massive new building that would dwarf the old executive mansion and seat 1,000 guests for dinner.

But a federal judge in Washington ruled that Trump had overstepped his authority, and the U.S. Court of Appeals agreed in a 2-1 ruling on Aug. 7.

Those judges would stop the above-ground construction but put their decision on hold until this Friday. This gave the administration time to appeal to the Supreme Court.

The National Trust for Historic Preservation had sued, arguing that the president has no authority to erect new buildings on government property.

Federal law protects “historic buildings, parks, and places, including perhaps the most revered site in our nation: the White House and President’s Park,” the group told the court Tuesday. It is “more than the President’s residence” and “is owned by American people.”

The historic trust said Trump is moving quickly so as to bypass the law.

“Rather than obtain permission from Congress,” Trump and his appointees “have instead decided to try to outrun judicial review,” it said.

Meanwhile, Trump’s lawyers have taken to describing the ballroom as a national security project.

Last week, Solicitor Gen. D. John Sauer told the justices they should throw out the “extraordinary and unlawful injunction that will halt the ongoing construction of the integrated military complex” because “a totally secure ballroom space ... is vitally required by national security.”

He also contended it is too late for judges to intervene.

“Today, the project is 65% complete in its entirety, and moving quickly toward total completion. A concrete-and-steel superstructure stretches five stories deep and 70 feet high, and occupies nearly 50,000 square feet, with construction on and above the second-story level above ground.”

While the plans have changed, the “work has followed a single coherent design,” he wrote. “By now, it has passed the point where major changes to (that) design are feasible.”

U.S. District Judge Richard Leon, a George W. Bush appointee who ruled on the lawsuits, agreed the White House may proceed with the underground work to create a safe and secure location for the president, his family and White House employees.

The solicitor general said a new and secure ballroom is also crucial for social gatherings and foreign dignitaries.

He said that if Leon’s ruling is “allowed to go into effect, the injunction would wrongfully install a single district judge as sole arbiter of what further construction is strictly necessary to protect the safety of the President, his family, staff members, and visitors to the White House, including foreign dignitaries, and presidents and prime ministers of other countries.”

Sauer also argued the lawsuit should be thrown out on the grounds that National Trust for Historic Preservation and its members have no standing to sue because they have not suffered a particular injury.

The D.C. Circuit judges split on that issue. Judges Patricia Millett, an Obama appointee, and Bradley Garcia, a Biden appointee, ruled the plaintiffs had standing to sue. Judge Neomi Rao, a Trump appointee, dissented and said the members of the historic trust did not have standing.

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