Why is Trump’s ballroom a national security matter? Bomb shelters, military facilities explained

On Saturday, an appeals court upheld an order halting work on Donald Trump's planned White House ballroom, sparking anger from the US leader and setting the stage for a potential Supreme Court showdown over the boundaries of presidential authority. The US Court of Appeals for the DC Circuit agreed with a lower court that such a substantial overhaul of the White House necessitated explicit congressional approval.

The court temporarily halted its decision for two weeks to allow Trump the opportunity to seek intervention from the Supreme Court.

Trump reacted swiftly, criticizing the 2-1 ruling as "horrific, politically motivated, and unlawful." The two majority judges were appointed by Democratic presidents, while the dissenting judge was nominated by Trump himself. The president vowed to immediately appeal the decision to the Supreme Court. He asserted that the decision posed a severe national security threat and was a national disgrace.

Initially, Trump saw the construction of the ballroom as essential for hosting galas, but later emphasized the inclusion of an underground military bunker and other security elements. The district judge's original order permitted construction on a limited set of structures, mainly those underground. The majority opinion stated that the decision was not about the desirability of the ballroom as a policy matter, but rather that the Defendants could not proceed with the construction during the district court's expedited litigation without securing Congress's authorization, as required by the Constitution and laws.

Trump, who has long complained of insufficient space for grand galas such as state dinners, unilaterally began construction of the large ballroom last year, following the historic East Wing's sudden demolition. Since then, significant work has been visible on a basement complex, with some concrete walls emerging above ground. Trump has claimed the ballroom would be privately financed, but reports in June indicated substantial taxpayer money was being allocated to the project, potentially costing up to $600 million.

The White House had initially estimated the project at $200 million, later increasing it to $400 million. The ballroom is just one of Trump's numerous projects aimed at leaving his mark on Washington before his departure in 2029, including renovations to the Lincoln Memorial Reflecting Pool and other parks, as well as the construction of a massive arch.

Several of these projects have faced legal challenges, but the ballroom project is the first to reach the Supreme Court.