(NBCNC) - Washington wakes up this morning, dealing with fallout from the resignation of CIA Director General David Petraeus.
He stepped down after admitting an extra-marital affair, but now may be needed to help Congress sort out what led to the deadly attacks in Benghazi, Libya.
The FBI was not investigating General Petraeus, or his emails. They were looking at emails sent by the woman he's accused of having an affair with.
Multiple federal officials tell NBC news that the FBI investigation began with a complaint from this woman, Jill Kelley of Tampa, who with her husband is close personal friends with Petraeus and his wife.
Kelley complained that she was receiving anonymous, emails from someone she did not know.
Officials tell NBC news that those e-mails led to the discovery of others between general Petraeus and Paula Broadwell -- that were indicative of an extra-marital affair.
Previously, Broadwell spoke publicly about her access to the general: "I was embedded with General Petraeus in Afghanistan and it was a little confusing for some of the folks there because I'm also a military reservist with a top secret clearance and then some. So a lot of my former peers didn't know how to treat me," said Army Reservist Officer Paula Broadwell.
General Petraeus is not under investigation. He has resigned and spoke with his former spokesperson Saturday. "He said he had an excellent job, exceptional family, had a great relationship with the White House and in his words, he screwed up and he knows it,ÃƒÆ'Ã†â€™Ãƒâ€šÃ‚Â¢ÃƒÆ'Ã‚Â¢ÃƒÂ¢Ã¢â€šÂ¬Ã...Â¡Ãƒâ€šÃ‚Â¬ÃƒÆ'Ã¢â‚¬Å¡Ãƒâ€šÃ‚Â said Former Petraeus Spokesman Steven Boylan
Now, NBC news has confirmed Petraeus conducted his own investigation on the ground in Libya.
Congress is beginning hearings into the deadly attack there and may still ask Pghetraeus to testify: "Apparently there are videos and tapes and pictures and things that can be shown, so it's, uh, it is not going away," said Bob Woodward, The Washington Post.
"There were five attacks during the year, one prior attack on the consulate itself. The question I have, is, you know, why wasn't something done about it?" Senator Dianne Feinstein (D-CA)/ Chairwoman, Senate Select Cmte on Intelligence
General Petraeus may have answers, if he testifies - now, as a civilian.