Donald Trump’s $400 million White House ballroom project has hit a major legal roadblock after a federal appeals court ordered above-ground construction to halt. The judges said Congress must decide whether such a massive transformation of the White House can move forward, while Trump has vowed to immediately appeal to the US Supreme Court. The ruling comes as the administration continues other major White House renovations, putting fresh focus on presidential power, congressional authority and the future of Trump’s ambitious ballroom plan.