Former Biden security adviser to join Obama's staff

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In the same announcement, the White House also said that Ambassador Brooke Anderson, who previously served as deputy assistant to the president, and chief of staff and counselor on the National Security staff, is leaving the administration. 

"I have been deeply appreciative of Brooke Anderson’s service dating back to 2007. From her work advancing America’s interests as an Ambassador at the United Nations, to supporting a democratic transition in Egypt, and reducing nuclear weapons threats, to her strong and steady leadership of the National Security Staff, Brooke has been a close, trusted and valued advisor for many years," Obama said in the statement. "I know that Brian McKeon will be an exceptional advisor and leader going forward."