Gen. James Jones is calling it quits as President Obama's national security adviser...
While Jones' resignation is not unexpected, he is the latest high-profile official to leave Obama's administration following Chief of Staff Rahm Emanuel's departure last week.
Last month, Christina Romer stepped down as Obama's top economic adviser and Larry Summers announced he would leave as director of the president's National Economic Council at the end of the year. Budget Director Peter Orszag left the administration in July. Dennis Blair resigned as the nation's intelligence director in May.
More leadership changes are expected as Obama nears the two-year mark of his term and the grueling pace of the White House takes a toll.