Former US President Jimmy Carter

In this March 26, 1979 file photo, from left, Egyptian President Anwar, U.S. President Jimmy Carter and Israeli Prime Minister Menachem Begin clasp hands after signing the Camp David Accords. The historic agreement negotiated by Carter ended the hostilities between Israel and Egypt. (AP Photo/Bob Daugherty, File)

In this undated file photo, Jimmy Carter gets his bar pinned by his wife Rosalynn, left, and his mother Lillian Carter at the U.S. Naval Academy.

In this Jan. 20, 1977 file photo, President Jimmy Carter and First Lady Rosalynn Carter walk to the White House after being sworn in as the 39th president.

One of 60 U.S. hostages, blindfolded and with his hands bound, is being displayed to the crowd outside the U.S. Embassy in Tehran by Iranian hostage takers. The hostage crisis overshadowed all other events of the Carter presidency.

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)

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.

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.

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)