Washington D.C. — FBI and CIA officials will travel Wednesday to Capitol Hill to brief the House Intelligence Committee's chairman and its top Democratic member on the resignation of CIA Director David Petraeus and the investigation that led up to it, according to a committee staffer.
Later, President Barack Obama will probably address the situation in his first news conference since he was re-elected.
Obama has so far not commented publicly on the scandal, which threatens to gum up the administration's focus on critical fiscal negotiations. On Tuesday, White House spokesman Jay Carney said that he "wouldn't call it welcome."
In Congress, some lawmakers in both parties are increasingly concerned that they were not notified sooner of the investigation that led to Petraeus' downfall, as well as potential security breaches.
"I have many questions about the nature of the FBI investigation, how it was instituted," Senate Intelligence Committee Chairwoman Dianne Feinstein, D-California, said Tuesday. "And we'll be asking those questions."
The closed-door briefings for House Intelligence Committee Chairman Mike Rogers, R-Michigan, and ranking member Dutch Ruppersberger, D-Maryland, will consist of a "big-time dive" on issues surrounding Petraeus' resignation and whether Congress should have been notified sooner, a source with knowledge of the meeting said Monday.
FBI Deputy Director Sean Joyce and acting CIA Director Mike Morell will brief the lawmakers, a committee staffer previously told CNN.
Panetta defends Allen decision
Secretary of Defense Leon Panetta on Wednesday defended his request to withhold the nomination of Gen. John Allen to become NATO commander pending the investigation into his contacts with Jill Kelley, the woman whose complaints about anonymous, harassing e-mails led to the discovery of Petraeus' affair with Paula Broadwell, his former biographer.
Defense officials announced Tuesday that the FBI had referred information to them indicating Allen may have exchanged what a defense official described as "flirtatious" e-mails with Kelley, who is an unofficial volunteer at MacDill Air Force Base. Allen was once stationed at the base.
Allen has denied wrongdoing, a senior defense official said. Sources familiar with Kelley have said the relationship between the two was not sexual, but one said that the e-mails were flirtatious.
"There is no affair," a senior official close to Allen said. "She is a bored rich socialite involved with every single senior commander at CENTCOM, because she worked as an honorary ambassador."
The move to delay Allen's nomination was "a prudent measure until we can determine what the facts are, and we will," Panetta told reporters Wednesday. "No one should leap to any conclusions."
He said Allen "certainly has my continued confidence to lead our forces," a viewpoint shared by Obama, according to White House spokesman Jay Carney.
While the nature of the relationship between Allen and Kelley, if any, is unclear, evidence of an affair could subject the general to military prosecution. Adultery is a violation of military law.
That Allen remains in command in Afghanistan suggests that there is no criminal issue, a U.S. official told CNN. But the official said the Defense Department's inspector general, an agency watchdog, could still find evidence of criminal conduct.
Kelley has not responded publicly to the latest news.
Both Allen and Petraeus appear to know Kelley's sister, Natalie Khawam. The men wrote letters in support of the sister in a custody battle, court records show.
One of the sources familiar with Kelley said she first mentioned the alleged harassment in a casual conversation with an FBI agent she knew socially. She did not seek him out specifically for action on the matter, but he was happy to help, the source said. The source added that Kelley did not know at first that the e-mails led to Petraeus.
Kelley, 37, and her husband have released a statement saying they have been friends with Petraeus and his family for more than five years and asked for privacy.
Petraeus' affair and national security questions
Meanwhile, details continue to emerge Wednesday about the Petraeus affair.
A source familiar with Kelley's version of events said the anonymous e-mails later traced to Broadwell -- which led to the discovery of Petraeus' affair -- began in June. It wasn't until two months later that the FBI told Kelley who had sent the e-mails, said the source, adding that Kelley does not know Broadwell and has never met her.
On Monday, FBI agents were at Broadwell's home in Charlotte, North Carolina, according to spokeswoman Shelley Lynch. She declined to say what the agents were doing there.
A source told CNN national security contributor Fran Townsend that Broadwell was acting as Petraeus' archivist and that the FBI went to the house to look for any documents she might have. It was not clear, the source said, whether any of the material was classified.
The Internet has been abuzz with video of a speech by Broadwell in which she suggested the Libya attack last September 11 was targeting a secret prison at the Benghazi consulate annex, raising unverified concerns about possible security leaks.
"I don't know if a lot of you have heard this, but the CIA annex had actually taken a couple of Libyan militia members prisoner and they think that the attack on the consulate was an effort to get these prisoners back," she said in a speech last month at the University of Denver.
A senior intelligence official denied the claims, saying no prisoners were ever held at the annex. Broadwell did not provide a source for her information, and there's no evidence so far that it came from Petraeus.
Administration officials have said the Benghazi assault was a terrorist attack.
Petraeus was scheduled to testify on Capitol Hill this week about the Benghazi attack at closed-door hearings. Some Republicans have criticized the administration's response to the attack and have speculated that the timing of Petraeus' departure was linked to the congressional inquiry.
Feinstein said Tuesday that she hopes to bring Petraeus before the panel as early as Friday.