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Retired Army Gen. David Petraeus resigned from his post as CIA director last week after an FBI investigation revealed he had an extramarital affair. The investigation also prompted questions about whether his paramour had inappropriate access to classified information. The scandal also has sparked an investigation into whether Marine Corps Gen. John Allen, the top U.S. commander in Afghanistan, sent inappropriate messages to a different woman, leading President Obama to put Allen's nomination to become NATO's supreme allied chief on hold. The FBI uncovered the Petraeus affair while it investigated e-mails that his paramour, Paula Broadwell, allegedly sent to a Petraeus family friend, Jill Kelley, according to a U.S. official. Kelley, meanwhile, is the woman to whom Allen allegedly sent inappropriate e-mails, according to the Defense Department.

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Obama said Wednesday that he had seen no evidence of a potentially damaging breach in national security stemming from the affair involving Petraeus.