A federal appeals court on Friday barred President Donald Trump from building a ballroom at the White House without congressional approval, prompting the president to vow an appeal to the Supreme Court. The U.S. Court of Appeals for the D.C. Circuit upheld a lower court's ruling that a project of this scale required explicit consent from Congress. The panel had previously allowed construction to continue while it weighed the case, but now sided with the lower court, ordering a halt to the work. Trump denounced the decision as unjust and a national disgrace, and said he would take the case to the nation's highest court. The ruling represents a significant setback for the president's long-planned overhaul of the White House, which he has described as a personal priority. The case now moves to the Supreme Court, where Trump's lawyers are expected to argue that the president has authority to manage the White House without legislative approval. The appeals court's decision effectively freezes the project unless the Supreme Court intervenes.