David Petraeus

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**FILE** President Barack Obama, accompanied by Gen. David Petraeus (center) and Defense Secretary Robert Gates, announces in the Rose Garden of the White House on June 23, 2010, that Gen. Petraeus would replace Gen. Stanley McChrystal. (Associated Press)

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U.S. President Barack Obama returns to the Oval Office with Secretary of Defense Robert Gates (R) after announcing Gen. David Petraeus will replace Gen. Stanley McChrystal as the top U.S. commander in Afghanistan in the Rose Garden of the White House in Washington on June 23, 2010. UPI/Roger L. Wollenberg

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The Senate Armed Services Committee's ranking Republican, Sen. John McCain, left, R-Ariz., left, accompanied by fellow committee members, Sen. Joseph Lieberman, I-Conn., and Sen. Lindsey Graham, R-S.C., walk to a news conference on Capitol Hill in Washington, Wednesday, June 23, 2010, to discuss the confirmation hearings for Gen. David Petraeus. (AP Photo/Alex Brandon)

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Senate Armed Services Committee members, from left, Sen. John McCain, R-Ariz., the committee's ranking Republican, Sen. Lindsey Graham, R-S.C., and Sen. Joseph Lieberman, I-Conn., take part in a news conference on Capitol Hill in Washington, Wednesday, June 23, 2010, to talk about confirmation hearings for Gen. David Petraeus. (AP Photo/Alex Brandon)

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President Barack Obama stands with (from second from left) Joint Chiefs Chairman Adm. Mike Mullen, Vice President Joe Biden, Gen. David Petraeus, and Defense Secretary Robert Gates, in the Rose Garden of the White House on Wednesday to announce that Petraeus would replace Gen. Stanley McChrystal. (Associated Press)

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** FILE ** President Obama, followed by, from second from left, Gen. David Petraeus, Defense Secretary Robert Gates, Vice President Joseph R. Biden Jr., and Joint Chiefs Chairman Adm. Michael Mullen, walks to the Rose Garden of the White House in Washington, Wednesday, June 23, 2010. (AP Photo/Charles Dharapak)

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Gen. David Petraeus, who leads the U.S. Central Command, arrives at the White House in Washington on Wednesday, June 23, 2010, before the start of the national security team meeting on Afghanistan and Pakistan in the Situation Room. (AP Photo/Evan Vucci)

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Gen. David Petraeus, commander of the U.S. Central Command, testifies before the Senate Armed Services Committee in Washington, Wednesday, June 16, 2010. (AP Photo/Drew Angerer)

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Gen. David Petraeus, commander of the U.S. Central Command, testifies before the Senate Armed Services Committee in Washington, Wednesday, June 16, 2010. (AP Photo/Drew Angerer)

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Army Gen. David Petraeus, U.S. Central commander, is surrounded by staff after appearing to collapse on Capitol Hill in Washington on Tuesday, June 15, 2010, while testifing before the Senate Armed Services Committee. (AP Photo/Evan Vucci)

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Army Gen. David Petraeus, U.S. Central commander, rises out of his chair after appearing to collapse on Capitol Hill in Washington on Tuesday, June 15, 2010, while appearing before the Senate Armed Services Committee. (AP Photo/Evan Vucci)

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Army Gen. David Petraeus, U.S. Central Commander, is led away by staff after appearing to collapse on Capitol Hill in Washington on Tuesday, June 15, 2010, while testifying before the Senate Armed Services Committee. (AP Photo/Evan Vucci)

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Commander of the U.S. Central Command, Gen. David Petraeus, is surrounded by staff after appearing to pass out on Capitol Hill in Washington, Tuesday, June 15, 2010, while testifing before the Senate Armed Services Committee. Gen. Petraeus, who was dehydrated, left the room but returned after 20 minutes. (AP Photo/Evan Vucci)