Former US President Jimmy Carter

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David Roeder shouts and waves as he arrives at Rhein-Main U.S. Air Force base in Frankfurt, West Germany from Algeria on January 21, 1981. He was among 52 Americans held hostage in Iran for 444 days after their capture at the U.S. Embassy in Tehran. (AP Photo)

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Former President Jimmy Carter helps cut wood for home construction at a Habitat for Humanity construction site in the Globeville neighborhood of Denver, Wednesday Oct. 9, 2013.

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Former U.S. President Jimmy Carter, center, observes the election process inside a polling station in the Sayeda Aisha neighborhood of Cairo, Egypt, Wednesday, May 23, 2012. The Carter Center is in Egypt to monitor the presidential elections.

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Former U.S. President Jimmy Carter pours water on a Buddha statue as he visits the famed Shwedagon Pagoda Friday, April 5, 2013 in Yangon, Myanmar. Carter arrived in Myanmar Tuesday to support the country's ongoing democratic transition. (AP Photo/Khin Maung Win)