Washington: The US federal appeals court has halted above-ground construction of Trump’s proposed $400 million White House ballroom project. What is Trump’s White House ballroom project? US President Donald Trump’s planned $400 million White House ballroom project is a major expansion plan aimed at adding a large event space to the presidential complex in Washington, DC. However, the court paused the order for 14 days, allowing the Trump administration time to seek possible intervention from the US Supreme Court. Why did the court stop the White House ballroom plan?