(WASHINGTON) -- Paula Broadwell, the author suspected of carrying on an affair with former CIA director David Petraeus, has been stripped of her military security clearance after a federal probe alleged she was storing classified military material at her home.
"Appropriate actions with regard to this officer's clearance and access have been taken," said Army spokesman George Wright of Broadwell, an Army reservist and West Point graduate.
The inquiry into Broadwell came as Petraeus, one of the country's most decorated generals, was being pressed to appear before Congress to answer questions about the Sept. 11 terror attack on the U.S. consulate in Benghazi, Libya.
Petraeus is expected to appear at a closed-door session of Congress on Thursday, nearly a week after he publicly admitted to having an affair and resigned his post at CIA.
Petraeus was reluctant to testify following his resignation as CIA chief, but pressure has been growing in Congress for him to appear.
"Gen. Petraeus is willing to come before the committee and the details are being worked out," Sen. Diane Feinstein, chairwoman of the Senate Foreign Relations Committee, said Wednesday. No date for his testimony has been set.
A source familiar with the case told ABC News that Broadwell admitted to the FBI she took documents from secure government buildings. The government demanded that they all be given back, and federal agents descended on her North Carolina home on Monday night in pre-arranged visit.
Prosecutors were determining whether to charge Broadwell with a crime and Wednesday morning the FBI and military were poring over the material.
The 40-year-old author, who wrote the biography on Gen. Petraeus, All In, is cooperating with the investigation. The case is complicated by the fact that, as an intelligence officer in the U.S. Military Reserve, Broadwell had security clearance to review the documents.
At a news conference Wednesday afternoon, President Obama said there was no evidence that the material contained secrets crucial to the country's national security.
"I have no evidence at this point, from what I've seen, that classified information was disclosed that in any way would have had a negative impact on national security," he said.
The FBI found classified material on a computer voluntarily handed over by Broadwell earlier in the investigation. Prosecutors will now have to determine how important the classified material is before making a final decision on how to proceed. Authorities could decide to seek disciplinary action against her rather than pursue charges.
Senior FBI officials were expected to brief the House and Senate Intelligence Committees Wednesday on their handling of the Petraeus investigation. The officials were expected to lay out how the case was developed and argue that there were no politics involved.
The case was so critical that FBI Director Robert Mueller may attend to defend the bureau, ABC News has learned. Members of Congress have been angry that they were not informed about the case before the story was reported by the media, but FBI officials maintained that their guidelines forbade them from discussing ongoing criminal cases.
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