Bill Clinton

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Former U.S. Secretary of State Hillary Rodham Clinton, former U.S. President Bill Clinton and their daughter Chelsea arrive for the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto, near Johannesburg, South Africa, Tuesday Dec. 10, 2013. (AP Photo/Peter Dejong)

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Former U.S. President Bill Clinton and Former U.S. President George W. Bush, right, wave while Chelsea Clinton walks past during the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Matt Dunham)

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Former U.S. President Bill Clinton gestures during the memorial service for former South African president Nelson Mandela at the FNB Stadium in Soweto near Johannesburg, Tuesday, Dec. 10, 2013. (AP Photo/Matt Dunham)

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Former President Bill Clinton speaks with Jordan’s Queen Rania during the memorial service for former South African President Nelson Mandela at the FNB stadium in Johannesburg, South Africa Tuesday, Dec. 10, 2013. (AP Photo/Ben Curtis)

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President-elect Barack Obama is welcomed by President George W. Bush for a meeting at the White House in Washington, Wednesday, Jan. 7, 2009, with former presidents, from left, George H.W. Bush, Bill Clinton and Jimmy Carter. (AP Photo/J. Scott Applewhite)

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President Bush meets with former President George H.W. Bush, right, and former President Bill Clinton, left, in the Oval Office of the White House, Thursday, Sept. 1, 2005. Bush, who will tour the hurricane-devastated Gulf Coast region on Friday, has asked his father, former President George H.W. Bush, and former President Bill Clinton to lead a private fund-raising campaign for victims as they did for last year's Asian tsunami. (AP Photo/Susan Walsh)

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Former President Bush, right, and former President Bill Clinton emerge from meetings at the State Department Tuesday, March 8, 2005 in Washington. Former President Bill Clinton will undergo a medical procedure this week to remove fluid and scar tissue from his left chest, six months after he underwent quadruple bypass surgery, his office said Tuesday. (AP Photo/Charles Dharapak)

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From left, South African President Nelson Mandela, U.S. President Bill Clinton, first lady Hillary Rodham Clinton and Graca Machel, companion of Mandela talk inside the Section B, prison cell No. 5 at the Robben Island, South Africa prison Friday, March 27, 1998. (AP Photo/Pool, J. Scott Applewhite)