Symone Sanders, Vice President Kamala Harris' chief spokesperson and senior adviser, is leaving the Biden administration at the end of the year, according to a source familiar with the decision. "Symone has served honorably for 3 years," the source told CNN. "The President and Vice President are grateful for Symone's service and advocacy for this White House. She is a valued member, a team player, and she will be missed. We are grateful to have her working through the end of the year."