George Bush

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Former President Bill Clinton, left, Sen. Barack Obama, center, and former president George Bush meet with hurricane Katrina evacuees in the Reliant Center adjacent to the Astrodome in Houston, Monday, September 5, 2005. (AP Photo/Richard Carson, Pool)

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President and Mrs. George Bush are given a send-off by White House staffers Monday morning on the South Lawn of the White House as they departed to fly to Indianapolis, Ind., and then on to the Republican Convention in Houston, Texas. (AP Photo/J. Scott Applewhite)

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U.S. President George Bush shakes hands with Soviet President Mikhail Gorbachev at the conclusion of their joint news conference ending the one day summit, Sunday, Sept. 9, 1990 in Helsinki. (AP Photo/Liu Heung Shin)

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President-elect George Bush waves to the Houston rally honoring him while surrounded by his family after his election to the nation's top office, Nov. 9, 1988. (AP Photo)

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Vice President George Bush addresses the Republican National Convention to accept its nomination for a second term in Dallas, Thursday, Aug. 23, 1984. (AP Photo)

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President Ronald Reagan and Vice President George Bush discuss the formation of the President's Task Force on Regulatory Relief, which will be headed by Bush, over lunch in the Oval Office at the White House in Washington on Thursday, Jan. 22, 1981. (AP Photo)

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George Bush beams as some of his family members applaud at the National Press Club in Washington on Tuesday, May 1, 1979 where he formally announced his candidacy for the Republican presidential nomination. From left are: John E., a son; Columba, a daughter-in-law; Marvin, a son; Dorothy, a daughter; Mrs. Barbara Bush, his wife; and Bush. (AP Photo/Taylor)

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George Bush is sworn in as new director of the Central Intelligence Agency by Supreme Court Associate Justice Potter Stewart, left, as Mrs Barbara Bush and President Gerald Ford, at right, look on at CIA headquarters in Langley, Va., January 30, 1976. Bush succeeds William Colby who retired. (AP Photo)

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George Bush of Houston, Republican candidate for the U.S. Senate, waves to backers who cheer him after he addressed the Republican State Convention in Austin, Texas, Sept. 15, 1964. Bush seeks the seat held by Sen. Ralph Yarborough. (AP Photo)

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"Diplomatic immunity must not become diplomatic impunity" - Mark P. Lagon, who headed the State Department's Office to Monitor and Combat Trafficking in Persons under President George W. Bush. (State.gov)

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President George W. Bush waves as he stands next to his daughter Barbara as they pass by on his father's, former President George Bush, fishing boat Fidelity III, off the coast of Kennebunkport, Maine, on Saturday morning, June 30, 2007. Former President Bush pilots his boat as a Secret Service agent and his fishing guide, Billy Bush (left), stand behind. (AP Photo/Stephan Savoia)

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A presidential Thanksgiving past: President George W. Bush prepares to serve dinner to U.S. troops in Baghdad after paying a surprise Thanksgiving Day visit to Iraq in 2003. (AP Photo/Pablo Martinez Monsivais)

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**FILE** President George W. Bush (right) stands with Gen. David Petraeus as he arrives Sept. 3, 2007, for a surprise visit at Al-Asad Airbase in Anbar province, Iraq. (Associated Press)