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COLLEGE STATION, UNITED STATES: (From L-R) Former US presidents Jimmy Carter and George Bush, US President Bill Clinton, and former president Gerald Ford stand in front of a replica of the White House at the George Bush Library at Texas A&M University in College Station, TX, 06 November. The current and former presidents of the US and a host of former world leaders and policy makers attended the 0 November dedication of the library. (ELECTRONIC IMAGE) AFP PHOTO Paul J. RICHARDS (Photo credit should read PAUL J. RICHARDS/AFP via Getty Images)

COLLEGE STATION, UNITED STATES: (From L-R) Former US presidents Jimmy Carter and George Bush, US President Bill Clinton, and former president Gerald Ford stand in front of a replica of the White House at the George Bush Library at Texas A&M University in College Station, TX, 06 November. The current and former presidents of the US and a host of former world leaders and policy makers attended the 0 November dedication of the library. (ELECTRONIC IMAGE) AFP PHOTO Paul J. RICHARDS (Photo credit should read PAUL J. RICHARDS/AFP via Getty Images)
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AFP PAUL J. RICHARDS

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13th September 1993: Portrait of American presidents (L-R) Jimmy Carter, George Bush, Bill Clinton and Gerald Ford posing in front of a portrait of George Washington at the White House, Washington, D.C. (Photo by Consolidated News Pictures/Getty Images)

13th September 1993: Portrait of American presidents (L-R) Jimmy Carter, George Bush, Bill Clinton and Gerald Ford posing in front of a portrait of George Washington at the White House, Washington, D.C. (Photo by Consolidated News Pictures/Getty Images)
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Archive Photos Consolidated News Pictures

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381654 02: President Clinton poses with former Presidents George Bush, Gerald Ford and Jimmy Carter and first ladies, past and present, Barbara Bush, Lady Bird Johnson, Hillary Rodham Clinton, Betty Ford and Rosalynn Carter (L-R) in the State Dining Room of the White House, November 9, 2000. Clinton and the former presidents are celebrating the 200th anniversary of the White House. (Photo by Michael Smith/Newsmakers)

381654 02: President Clinton poses with former Presidents George Bush, Gerald Ford and Jimmy Carter and first ladies, past and present, Barbara Bush, Lady Bird Johnson, Hillary Rodham Clinton, Betty Ford and Rosalynn Carter (L-R) in the State Dining Room of the White House, November 9, 2000. Clinton and the former presidents are celebrating the 200th anniversary of the White House. (Photo by Michael Smith/Newsmakers)
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Hulton Archive Michael Smith

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WASHINGTON - JANUARY 7: Former President George H.W. Bush, President-elect Barack Obama, President George W. Bush, and former presidents Bill Clinton and Jimmy Carter pose together in the Oval Office on January 7, 2009 at the White House in Washington, D.C. This was only the fifth time that five presidents have appeared together. (Photo by David Hume Kennerly/Getty Images)

WASHINGTON - JANUARY 7: Former President George H.W. Bush, President-elect Barack Obama, President George W. Bush, and former presidents Bill Clinton and Jimmy Carter pose together in the Oval Office on January 7, 2009 at the White House in Washington, D.C. This was only the fifth time that five presidents have appeared together. (Photo by David Hume Kennerly/Getty Images)
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Getty Images News David Hume Kennerly