Donald Trump just admitted the REAL reason for building his massive White House ballroom: a secret underground lair! While speaking to press aboard Air Force One on Sunday, as seen in a video shared by the White House, the 79-year-old dismissed the expensive new White House ballroom as a glorified "shed" to cover what he REALLY has his sights set on: a secret underground "complex" built by the US military. He said: "The military is building a big complex under the ballroom, which has come out recently because of a stupid lawsuit that was filed.