"Symone has served honorably for 3 years. First as a valuable member of the President's 2020 presidential campaign, then as a member of his transition team and now deputy assistant to the President and senior advisor/chief spokesperson to the Vice President," the official told the Washington Examiner in a statement. "Grateful to have her working through the end of the year."
Word of Sanders's exit comes amid reports of a disturbance between the West Wing, Harris's office, and some of the Vice President's advisers.
Peter Velz, the Vice President's Director of Press Operations, is leaving Harris's office "in the coming weeks," along with Vince Evans, Deputy Director of Public Engagement and Intergovernmental Affairs, is also leaving, the Washington Post reported.
The Vice President's office has met significant turnover in recent months.
Harris's Communications Director, Ashley Etienne, a former top adviser to House Speaker Nancy Pelosi and former Obama Administration official, left in November, while many advance staffers headed for the exit over the summer. A CNN report last month announced Harris's Chief of Staff, Tina Flournoy, had trouble recruiting new staff.
Few of Harris's presidential campaign staff followed her to the White House from her Senate office. Before that, from her California Attorney General's office to Washington. Former advisers have announced that Harris is hard on her staff.
One former Harris adviser who remains close to the Vice President told the Washington Examiner that Sanders's retirement was "not the least bit surprising," and cited her prominent public profile. "I'm not a fan of the 'celebrity staffer' and I can't imagine Kamala is either," the ex-adviser stated.
This person continued, "She needs people who bring down the collective blood pressure."
Sanders is well regarded by Democratic operatives. One former Harris presidential campaign staffer praised her as a "f***ing genius" communications adviser.
In a letter to staff late Wednesday that was reported by Politico, Sanders addressed, "Shortly, Politico, CNN and lord know whoever else is going to report that I am leaving the office at the end of December. It's true and I'm sorry you all found out like this."
She went on: "I'm so grateful to the VP for her vote of confidence from the very beginning ... I am immensely grateful and will miss working for her and with all of you," she continued. "We are fighters. Our President and VP are fighters and I will continue to be on the team, fighting for them."