The White House will unveil new details on President Donald Trump's planned East Wing ballroom during a hearing early next month, according to a federal commission tasked with reviewing the project, Reuters reported. 

The new ballroom, which Trump has said would cost $400 million and would dwarf the adjacent White House building, has been challenged in court by preservationists, while Democratic lawmakers have called it an abuse of power and are investigating which donors are supporting it.

The National Capital Planning Commission, chartered by Congress to manage planning for Washington-area federal lands, said on its website that the White House will provide an "information presentation" on plans to rebuild the East Wing during a commission meeting on January 8, according to Reuters.