A federal appeals court has ordered an immediate halt to construction on the new White House ballroom. The three-judge panel ruled that the project requires explicit congressional approval, rejecting the administration's argument that the work could proceed under executive authority.

The U.S. Court of Appeals for the D.C. Circuit issued a 2-1 decision on Friday, finding that the scale of the construction is a legislative matter rather than a function of the executive branch. This ruling marks a significant turn in a legal battle that began last year when the National Trust for Historic Preservation sued to stop the project. The court has stayed its order for two weeks, providing a window for the administration to seek an emergency appeal at the Supreme Court.

While the White House maintains that the ballroom and its associated underground structures are vital for national security, the court emphasized that such construction decisions remain within the purview of Congress. Estimates for the project have risen significantly, with reports suggesting costs could reach at least $600 million.

President Trump criticized the ruling, describing it as politically motivated and arguing that the project is essential for the safety of future presidents and dignitaries. The administration intends to move forward with a challenge to this decision, setting up a high-stakes standoff before the highest court in the country.