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394509 01: U.S. President George W. Bush speaks to Vice President Dick Cheney by phone aboard Air Force One September 11, 2001 after departing Offutt Air Force Base in Nebraska. (Photo by Eric Draper/The White House/Getty Images)

394509 01: U.S. President George W. Bush speaks to Vice President Dick Cheney by phone aboard Air Force One September 11, 2001 after departing Offutt Air Force Base in Nebraska. (Photo by Eric Draper/The White House/Getty Images)

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WASHINGTON - OCTOBER 11, 2001: (SEPTEMBER 11 RETROSPECTIVE) U.S. President George W. Bush holds an American flag during a Memorial Service at the Pentagon October 11, 2001 in Arlington, Virginia. (Photo by Mark Wilson/Getty Images)

WASHINGTON - OCTOBER 11, 2001: (SEPTEMBER 11 RETROSPECTIVE) U.S. President George W. Bush holds an American flag during a Memorial Service at the Pentagon October 11, 2001 in Arlington, Virginia.  (Photo by Mark Wilson/Getty Images)

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NEW YORK - SEPTEMBER 10: (AFP OUT) U.S. President George W. Bush and first lady Laura Bush lay a wreath in commemoration of the fifth anniversary of the September 11, 2001 terrorist attacks on New York City and Washington, D.C. at Ground Zero, the site where the World Trade Center Tower 2 stood September 10, 2006 in New York, New York (Photo by Ron Sachs-Pool/Getty Images)

NEW YORK - SEPTEMBER 10: (AFP OUT) U.S. President George W. Bush and first lady Laura Bush lay a wreath in commemoration of the fifth anniversary of the September 11, 2001 terrorist attacks on New York City and Washington, D.C. at Ground Zero, the site where the World Trade Center Tower 2 stood September 10, 2006 in New York, New York  (Photo by Ron Sachs-Pool/Getty Images)