Health Secretary Robert F. Kennedy Jr. has fired two top deputies at the Department of Health and Human Services, ABC News has learned.

       Heather Flick Melanson, Kennedy's chief of staff, and Hannah Anderson, deputy chief of staff of policy, are departing, according to a department spokesperson and another person familiar with the decisions.

       Neither Flick nor Anderson immediately responded to an ABC News request for comment.

       No reason was given for the ousters. The person familiar with the situation told ABC that Kennedy "has every right to make personnel decisions."

       MORE: Video: Layoffs begin at HHS, including at the FDA and CDC

       "Secretary Kennedy has made a leadership change within the Immediate Office of the Secretary," according to a statement provided by an HHS spokesperson to ABC News. "Effective immediately, Matt Buckham will serve as Acting Chief of Staff."

       "Mr. Buckham currently serves as Kennedy’s White House liaison at the U.S. Department of Health and Human Services, where he oversees the recruitment and onboarding of political appointees across the agency. He brings valuable experience in personnel strategy and organizational management to this new role," the statement continued.

       "Secretary Kennedy thanks the outgoing leadership for their service and looks forward to working closely with Mr. Buckham as the Department continues advancing its mission to Make America Healthy Again," the statement concluded.

       Buckham will continue to serve as Kennedy's White House liaison, according to an administration official.