President Donald Trump revealed that the U.S. military is constructing a "massive" underground complex beneath his new $400 million, 90,000-square-foot White House ballroom. Speaking to reporters aboard Air Force One while holding renderings, Trump said the ballroom "essentially becomes a shield for what's being built under by the military." "The military is building a big complex under the ballroom, which has come out recently because of a stupid lawsuit that was filed," Trump said.