Doug Burgum, the interior secretary, announced plans to start work on the site of the 250-foot-tall triumphal arch. Final approval of the project is still pending.
The Supreme Court ruled on Monday that President Trump could continue his construction of a huge new ballroom for the White House where the East Wing used to be.
Lower-court rulings would have blocked construction of the 90,000-square-foot ballroom after finding that the Trump administration should have first sought approval from Congress.
The 90,000-square-foot ballroom project has grown in size and scope, with the president’s lawyers saying it is intertwined with the renovation of an underground military bunker.
Joshua Fisher, the director of White House management and administration, estimated that the construction of the White House ballroom was 65 percent complete.