Scott McClellan, former press secretary for U.S. President George W. Bush, is sworn in to testify at a House Judiciary Committee hearing in Washington, D.C., U.S., on Friday, June 20, 2008. McClellan told lawmakers he doesn't know whether Vice President Dick Cheney or other government officials committed a crime in connection with the leak of a CIA operative's identity.
Former U.S. President George W. Bush speaks at a Spousal Symposium at the John F. Kennedy Center for the Performing Arts on August 6, 2014 in Washington, DC. The symposium, sponsored by first lady Michelle Obama and former first lady Laura Bush, focuses on the role the spouses of world leader's play and the impact of investments in education, health, and economic development through public-private partnerships.
Credit: Pete Marovich
Former U.S. President George W. Bush puts his hand over his heart during the National Anthm at a immigration naturalization ceremony held at the George W. Bush Presidential Center on July 10, 2013 in Dallas, Texas. Bush delivered keynote remarks during the naturalization ceremony, where 20 candidates took the oath of allegiance and became American citizens.
Credit: Tom Pennington
U.S. President Barack Obama, former President George W. Bush, and former President Bill Clinton attend the opening ceremony of the George W. Bush Presidential Center April 25, 2013 in Dallas, Texas. The Bush library, which is located on the campus of Southern Methodist University, with more than 70 million pages of paper records, 43,000 artifacts, 200 million emails and four million digital photographs, will be opened to the public on May 1, 2013. The library is the 13th presidential library in the National Archives and Records Administration system.
Credit: Alex Wong
Former President George W. Bush speaks during Naturalization Ceremony at the George W. Bush Presidential Center on July 10, 2013 in Dallas, Texas.
Credit: Cooper Neill
Former U.S. President George W. Bush talks about his hopes for the Presidential Leadership Scholars program at the Newseum September 8, 2014 in Washington, DC. With the cooperation of the Clinton, Bush, Lyndon B. Johnson and George H. W. Bush presidential libraries and foundations, the new scholarship program will provide 'motivated leaders across all sectors an opportunity to study presidential leadership and decision making and learn from key administration officials, practitioners and leading academics.'
Credit: Chip Somodevilla
President George W. Bush and first lady Laura Bush attend the NCAA Men's Final Four Championship between the Connecticut Huskies and the Kentucky Wildcats at AT&T Stadium on April 7, 2014 in Arlington, Texas.