USAOn the same day he unveiled a review of his Afghanistan war strategy, President Barack Obama moved to bolster the White House national security team, which has been short-staffed after a series of changes.

Obama tapped Brooke Anderson, currently part of the U.S. mission to the United Nations, as chief of staff and counselor for the National Security Council.

An expert on nuclear nonproliferation, Anderson is ambassador and alternate representative for special political affairs at the UN.

She advised Obama’s campaign, helping to set up his July 2008 trip to Europe and the Middle East, and then was a spokeswoman on national security matters during Obama’s presidential transition.

At the NSC, she replaces Denis McDonough, who was promoted to deputy national security adviser. McDonough assumed his new role after Tom Donilon succeeded Gen. James Jones in the top job at NSC.