I'm not sure there actually is a "chief butler" in the Whitehouse. In the movie The Butler, the butler was a White House servant who worked on the staff of the White House Chief Usher, the manager of the staff and operations of the White House. Traditionally, the Chef Usher works up through the ranks of the White House Staff, but the past president brought in a Chief Usher from the Trump hotel chain. There was a controversy on Inauguration Day because Chief Usher Timothy Harleth had been dismissed from his job just before the Biden inauguration, and word had it that there was nobody to open the door when the Bidens arrived. Some accused Trump of firing the Chief Usher, but it could be Joe Biden who dismissed him. Snopes is not taking a stand on the issue - so apparently, it's not really an issue.

There's a good article about butlers and ushers in Vanity Fair from May 2017.

-Joe-