George H.W. Bush

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George H.W. Bush at summer camp in this 1939 photo. (AP Photo)

Former first lady Nancy Reagan and former President George H.W. Bush pose for photographs at the 2007 Ronald Reagan Freedom Award gala dinner honoring Bush, Tuesday, Feb. 6, 2007, in Beverly Hills, Calif. (AP Photo/Matt Sayles)

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Then-President George W. Bush (right) and his father, former President George H.W. Bush, wave as they leave St. John's Church in Washington on May 6, 2006. (Associated Press) **FILE**

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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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NORFOLK (May 16, 2012) Rear Adm. Ted N. Branch, commander of Naval Air Force Atlantic, addresses Sailors during an awards ceremony in the hangar bay aboard the aircraft carrier USS George H.W. Bush (CVN 77). George H.W. Bush received the Battle “E” Award, the Battenberg Cup Award and the Admiral Flatley Memorial Award in honor of the ship’s performance and safety record. (U.S. Navy photo by Mass Communication Specialist Seaman Brian Read Castillo/Released)

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In this Sept. 5, 2013 photo released by Roman Catholic Diocese of Portland, former President Bill Clinton, left, points to western cactus-themed socks worn by former President George H.W. Bush at Bush's home in Kennebunkport, Maine. Bush has donated the socks, an autographed picture of the moment, and a signed letter of authenticity to a silent auction for the Roman Catholic Diocese of Portland. (AP Photo/Clinton Foundation via the Roman Catholic Diocese of Portland )

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In this Sept. 21, 2013, photo, former President George H.W. Bush, seated center, prepares to sign the marriage license of longtime friends Helen Thorgalsen, right, and Bonnie Clement, left, in Kennebunkport, Maine, as officiant Nancy Sosa, third right, and Helen's daughter Lindsey, rear, look on. Bush was an official witness at the same-sex wedding, his spokesman said Wednesday, Sept. 25, 2013. (AP Photo/Susan Biddle)