David Petraeus resigns

General David Petraeus, director of the Central Intelligence Agency, has resigned, according to Andrea Mitchell of NBC News, citing an extramarital affair.

12:05 PM PT: Andrea Mitchell read from a letter sent to Petraeus staff: "To the team at the CIA headquarters, yesterday afternoon I went to the White House and asked the president to be allowed, for personal reasons, to resign from my position as Director of CIA. After being married for more than 37 years, I showed extremely poor judgment engaging in an extramarital affair. Such behavior is unacceptable, both as a husband as a leader of an organization such as ours. This afternoon, the president graciously accepted my resignation."

12:08 PM PT: Mitchell says CIA Deputy Director Michael Morell is rumored as a successor to Petraeus.

12:18 PM PT: Statement from Director of National Intelligencey James Clapper:

Director of National Intelligence James Clapper praised Petraues' service Friday afternoon.

'Since he took over as Director in September of last year, he and I have worked together to tackle some of the most challenging issues faced by the Intelligence Community in more than a decade,' Clapper said.

'Under his leadership, the CIA remained instrumental in providing our policy makers decision advantage through the best possible intelligence. I'm particularly thankful for Dave's unwavering support and personal commitment to my efforts to lead the Intelligence Community and integrate our intelligence enterprise.'

12:32 PM PT: President Obama's statement:

David Petraeus has provided extraordinary service to the United States for decades. By any measure, he was one of the outstanding General officers of his generation, helping our military adapt to new challenges, and leading our men and women in uniform through a remarkable period of service in Iraq and Afghanistan, where he helped our nation put those wars on a path to a responsible end. As Director of the Central Intelligence Agency, he has continued to serve with characteristic intellectual rigor, dedication, and patriotism. By any measure, through his lifetime of service David Petraeus has made our country safer and stronger.

Today, I accepted his resignation as Director of the Central Intelligence Agency. I am completely confident that the CIA will continue to thrive and carry out its essential mission, and I have the utmost confidence in Acting Director Michael Morell and the men and women of the CIA who work every day to keep our nation safe. Going forward, my thoughts and prayers are with Dave and Holly Petraeus, who has done so much to help military families through her own work. I wish them the very best at this difficult time.