FILE - This Sept. 6, 2011 file photo shows Holly Knowlton Petraeus 

FILE - This Sept. 6, 2011 file photo shows Holly Knowlton Petraeus holding the family bible as her husband David Petraeus is sworn in by Vice President Joe Biden as CIA Director, in the Roosevelt Room of the White House in Washington. Petraeus has resigned as director of the CIA after admitting he had an extramarital affair. (AP Photo/Pablo Martinez Monsivais, File)
Associated Press
FILE - This Sept. 6, 2011 file photo shows Holly Knowlton Petraeus holding the family bible as her husband David Petraeus is sworn in by Vice President Joe Biden as CIA Director, in the Roosevelt Room of the White House in Washington. Petraeus has resigned as director of the CIA after admitting he had an extramarital affair. (AP Photo/Pablo Martinez Monsivais, File)
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