"latimes ""President Obama will announce Friday that retired Gen. James L. Jones is resigning as national security advisor, to be replaced by deputy national security advisor Tom Donilon, an administration official confirmed. Jones' departure comes amid a larger turnover of staffers in the Obama White House this fall. Just a week ago, Obama announced in the East Room that Chief of Staff Rahm Emanuel was leaving. Several other changes in personnel are forthcoming, the result of what White House Press Secretary Robert Gibbs called the """"natural life expectancy"""" in the administration's pressure-cooker jobs. Donilon, a White House veteran and onetime State Department chief of staff, was under consideration to serve as Obama's new chief of staff. He has advised Obama on foreign policy matters since early in the president's campaign for the White House. However, Jones has signaled for weeks that he intended to leave by the end of the year, and many White House insiders considered Donilon the natural replacement. Jones, a retired four-star Marine general, has also been discussed as a possible replacement to Pentagon chief Robert Gates, who has announced his intention to leave the administration next year. The president will deliver a statement on the change in the Rose Garden at 1 p.m. EDT."""