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Sen. Susan M. Collins, R-Maine, ranking Republican on the Homeland Security and Governmental Affairs Committee, arrives for a closed briefing on Capitol Hill in Washington, Wednesday, Nov. 14, 2012. Earlier, Collins said it was "absolutely imperative" that former CIA Director David Petraeus testify, since he was CIA director during the attack and visited Libya afterward. (AP Photo/Pablo Martinez Monsivais)

Associated Press
Sen. Susan M. Collins, R-Maine, ranking Republican on the Homeland Security and Governmental Affairs Committee, arrives for a closed briefing on Capitol Hill in Washington, Wednesday, Nov. 14, 2012. Earlier,  Collins said it was "absolutely imperative" that former CIA Director David Petraeus testify, since he was CIA director during the attack and visited Libya afterward. (AP Photo/Pablo Martinez Monsivais)
Sen. Susan M. Collins, R-Maine, ranking Republican on the Homeland Security and Governmental Affairs Committee, arrives for a closed briefing on Capitol Hill in Washington, Wednesday, Nov. 14, 2012. Earlier, Collins said it was "absolutely imperative" that former CIA Director David Petraeus testify, since he was CIA director during the attack and visited Libya afterward. (AP Photo/Pablo Martinez Monsivais)
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