By Devan Cole, Betsy Klein, CNN(CNN) — A divided federal appeals court ruled Friday that President Donald Trump is unlawfully constructing a massive new ballroom at the White House, teeing up a high-stakes showdown over the issue before the Supreme Court. “We will be immediately appealing to the United States Supreme Court,” Trump wrote on Truth Social, calling on the nation’s highest court to overturn the decision “in its entirety.” “The district court seized supervision of construction at the White House, and my colleagues affirm this judicial overreach,” Rao wrote. The sprawling ballroom project has an estimated size of approximately 89,000 square feet, according to lead architect Shalom Baranes. By contrast, the primary White House structure, the Executive Mansion, is just 55,000 square feet.