Patraeus Sex Scandal: FBI Agent Who Launched Investigation Revealed

Kelley contacted agent Frederick Humphries after Petraeus' lover allegedly sent threatening emails.
3:00 | 11/15/12

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Transcript for Patraeus Sex Scandal: FBI Agent Who Launched Investigation Revealed
Tonight, the latest turn in the cia sex scandal, as we learn the identity of the fbi agent who sparked the investigation that brought down one of the nation's most powerful leaders, and is now implicated another. President obama himself spoke out today for the first time since the scandal broke, and my co-anchor terry moran has the latest. Ladies and gentlemen, the president of the united states. Reporter: As president obama sauntered into the east room of the white house for his post-victory news conference, the scandal that's engulfed the highest levels of his national security team still swirled around him. Tonight, abc news has learned the identity of the fbi agent who ignited the whole staggering chain of events. Fredrik humphreys, a 47-year-old fbi veteran who is active in counterterrorism cases, is friends with tampa socialite jill kelley who turned to him when she got some harassing e-mails. Meanwhile, in washington, paula broadwell, petraeus' former mistress, who allegedly sent the e-mails to kelley, remained in hiding at her brother's home. Today, the fbi said she illegally had classified material at her home in north carolina, though no charges have been filed. Jill kelley also remains at her home in tampa. Her access to centcom revoked. This afternoon at the white house, president obama finally weighed in on this scandal, declared that no breach of national security occurred and spoke with sadness of the fall of david petraeus. General petraeus had an extraordinary career. He served this country with great distinction and my main hope right now is that he and his family are able to move on and that this ends up being a single side note on what has otherwise been an extraordinary career. Reporter: But the real takeaway from the white house today? There's nothing like a re-election to give the president a jolt of confidence. I've got a mandate to help middle class families and families that are working hard to try to get in the middle class. That's my mandate. Reporter: Gone was the lackluster stumbling obama of the first debate in denver. Well, ah, ah, ah. Reporter: And gone, too, was the grimly determined campaigner of the final stretch. The status quo in washington has fought us every step of the way. Reporter: The 44th president today was ready to rumble. You heard and saw it most emphatically when he leapt to the defense on susan rice, the u.N. Ambassador. What this began has was a spontaneous, not a premeditated response to what had transpired in cairo. Cairo, as you know, there was a violent protest that was undertaken in reaction to this very offensive video that was disseminated. Reporter: Rice is now a leading candidate to replace hillary clinton as secretary of state. Top republicans led by senators john McCain and lindsey graham, they vowed to block her nomination. I don't trust her. And the reason I don't trust her is because I think she knew better and if she didn't know better, she shouldn't be the voice of america. Reporter: Today, an obama smackdown. IF senator McCain and senator graham and others want to go after somebody, they should go after me. And should I choose, if I think that she would be the best person to serve america, in the capacity of the state department, then I will nominate her. Reporter: But wait. Isn't this supposed to be a nt for bipartisanship? As the country approaches the fiscal cliff at the end of the year, unless washington can do a deal, what kind of leadership will the newly embdened bk obama bring to those old bitter debates? So, I will, you know, examine ways that I can make sure to communicate my desire to work with everybody. There are probably going to be very sharp differences. Reporter: Bridging those differences or even just beginning to heal them. That's the real task ahead for president obama.

This transcript has been automatically generated and may not be 100% accurate.

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