The White House Deputy Chief of Staff is officially the top aide to the White House Chief of Staff, who is the senior aide to the President of the United States. The Deputy Chief of Staff usually has an office in the West Wing and is responsible for ensuring the smooth running of the White House bureaucracy, as well as such other duties as the Chief of Staff assigns to him or her. In some administrations, there are multiple deputy chiefs with different duties.
In the Trump administration, there are three Deputy Chiefs of Staff:
Six Deputy Chiefs of Staff have subsequently been appointed White House Chief of Staff: Dick Cheney, Ken Duberstein, Andrew Card, Erskine Bowles, John Podesta, and Joshua Bolten.