As for who will fill Brennan's shoes as chief counterterrorism advisor to Obama, Cressey believes Morell may step in. That one-for-one exchange is an "obvious switch," he says, particularly after Morell has been working closely with Obama.
"That job requires coordination and implementation. You need somebody from in-house," he says. "[Obama has] a Chuck Hagel from the outside perspective. He's got John Kerry coming in as Secretary as State. You've got two senators with outside perspective. That's plenty."