Health and Human Services Secretary Robert F. Kennedy Jr. fired two of his top aides after only six months of service, in an abrupt change in leadership.

Trump administration officials confirmed to the Washington Examiner that Kennedy fired his chief of staff Heather Flick Melanson and deputy chief of staff for policy Hannah Anderson. Sources familiar with the matter told multiple outlets that Kennedy lost confidence in his two senior aides, but it is reportedly unclear whether or not there was a single triggering event that prompted the firings.