President Obama is expected to announce this week new appointments for top posts in his national security team. Leon Panetta, the current director of central intelligence, will be named as defense secretary. General David Petraeus, who is currently the top commander in Afghanistan, is expected to be named as director of the CIA. These announcements come as Defense Secretary Robert Gates plans on stepping down from his post this summer. We talk with Mark Landler, reporter for our partner The New York Times, to help preview Obama's new national security team.