A historic preservation group that sued to block construction of President Donald Trump’s White House ballroom has urged the U.S. Supreme Court to suspend the project while it considers whether the work can continue. The National Trust for Historic Preservation filed its request on Tuesday, less than a week after the Trump administration asked the nation’s highest court to allow the White House to continue construction on its $400 million ballroom project. The building of the 90,000-square-foot ballroom has included demolishing the East Wing of the White House. The petition comes after a divided appeals court panel upheld an order to pause aboveground construction on the project.