Bill Clinton

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Former president George W. Bush and wife Laura are seen with former president Bill Clinton, left, on the overhead scoreboard during the national anthem before the NCAA Final Four tournament college basketball championship game between Connecticut and Kentucky, Monday, April 7, 2014, in Arlington, Texas. (AP Photo/Tony Gutierrez)

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Former president Bill Clinton speaks at a student conference for the Clinton Global Initiative University at Arizona State University, in this March 21, 2014, file photo taken in Tempe, Ariz. (AP Photo/Ross D. Franklin, File)

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Former president Bill Clinton speaks at a student conference for the Clinton Global Initiative University at Arizona State University, Friday, March 21, 2014, in Tempe, Ariz. (AP Photo/Ross D. Franklin)