Former US President Jimmy Carter

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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)

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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.

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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.

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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.