AP source: Intelligence director to resign

WASHINGTON The official spoke on condition of anonymity because the announcement has not been made public.

A retired Navy admiral, Blair is the third director of national intelligence, a position created in response to the 9/11 attacks.

Blair's tenure as the overseer of the nation's intelligence agencies was marked by turf battles with CIA Director Leon Panetta and controversial public comments in the wake of the Christmas Day airliner bombing attempt.