Jimmy Carter

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In a Wednesday, Feb. 3, 2016, file photo, former U.S. President Jimmy Carter delivers a lecture on the eradication of the Guinea worm, at the House of Lords in London. A spokeswoman for Jimmy Carter says the former president does not need further treatment for cancer. The former president apparently shared the good news on Sunday, March 6, 2016, with those attending one of his regular Sunday school lessons at Maranatha Baptist Church in Carter's hometown of Plains, Georgia. (Neil Hall/Pool Photo via AP, File)

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In this Thursday, Nov. 20, 2014 photo, former U.S. President Jimmy Carter speaks during a forum in Boston. On Wednesday, Aug. 12, 2015, Carter announced he has cancer and will undergo treatment at an Atlanta hospital. (AP Photo/Elise Amendola)

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Paula McNeill, right, of Valdosta, Ga., has her photo taken by Melinda Groover, of Birmingham, Ala., as they visit the hometown of former President Jimmy Carter in Plains, Ga., Sunday, Aug. 23, 2015. Carter’s 1976 election to the presidency made Plains a tourist destination. The one-block business district specializes in Carter political memorabilia and peanut souvenirs. (AP Photo/David Goldman)

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In this file photo, the sun rises behind the steeple of Maranatha Baptist Church Sunday, Aug. 23, 2015, in Plains, Ga. (AP Photo/David Goldman) ** FILE **

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Former President Jimmy Carter opens up a Bible while teaching Sunday School class at Maranatha Baptist Church in his hometown Sunday, Aug. 23, 2015, in Plains, Ga. The 90-year-old Carter gave one lesson to about 300 people filling the small Baptist church that he and his wife, Rosalynn, attend. It was Carter's first lesson since detailing the intravenous drug doses and radiation treatment planned to treat melanoma found in his brain after surgery to remove a tumor from his liver. (AP Photo/David Goldman)

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Former President Jimmy Carter teaches Sunday School class at Maranatha Baptist Church in his hometown Sunday, Aug. 23, 2015, in Plains, Ga. The 90-year-old Carter gave one lesson to about 300 people filling the small Baptist church that he and his wife, Rosalynn, attend. It was Carter's first lesson since detailing the intravenous drug doses and radiation treatment planned to treat melanoma found in his brain after surgery to remove a tumor from his liver. (AP Photo/David Goldman)

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Former President Jimmy Carter talks about his cancer diagnosis during a news conference at The Carter Center in Atlanta on Thursday, Aug. 20, 2015. Carter announced that his cancer is on four small spots on his brain and he will immediately begin radiation treatment, saying he is "at ease with whatever comes." (AP Photo/Phil Skinner)

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Former President Jimmy Carter walks to a news conference followed by his wife, Rosalynn Carter, left, at The Carter Center in Atlanta on Thursday, Aug. 20, 2015. Carter announced that his cancer is on four small spots on his brain and he will immediately begin radiation treatment, saying he is "at ease with whatever comes." (AP Photo/Phil Skinner)

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In this Sunday, Aug. 16, 2015, file photo, former President Jimmy Carter reaches to embrace his brother Billy's widow Sybil while greeting family following service at Maranatha Baptist Church in Plains, Ga. (Ben Gray/Atlanta Journal-Constitution via AP, File)

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Former president Jimmy Carter discusses his latest book, "A Full Life," at the Carter Center, Wednesday, July 15, 2015, in Atlanta. Carter says he supports the historic deal to curb Iran's nuclear program, saying the U.S.-led agreement is "a major step in the right direction." (AP Photo/Ron Harris

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Former President Jimmy Carter speaks during the memorial service for Rev. Theodore Hesburgh, inside the Purcell Pavilion at the University of Notre Dame in South Bend, Ind., on March 4, 2015. Carter Center officials said Sunday, May 10, 2015, that Mr. Carter, 90, cut short an election observation visit in Guyana due to health reasons. (AP Photo/Robert Franklin, File)

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Russian President Vladimir Putin, left, greets former U.S. president Jimmy Carter and former U.N. Secretary-General Kofi Annan, right, as he meets with members of the Elders group in the Novo-Ogaryovo residence outside Moscow, Russia, Wednesday, April 29, 2015. (Sergei Karpukhin/Pool Photo via AP)

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Then-President Jimmy Carter delivers his State of the Union message, Jan. 23, 1980. (AP Photo)

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President-elect Jimmy Carter strolls on the grounds of Musgrove Estate, in St. Simons, Georgia, Nov. 7, 1976, where he and his family are vacationing. The estate is on St. Simons Island, Ga. (AP Photo/John Duricka)

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FILE -- In this Wednesday, May 23, 2012 file photo, former U.S. President Jimmy Carter, center, observes the election process inside a polling station in the Sayeda Aisha neighborhood of Cairo, Egypt. Carter is warning Egypt that its transition to democracy after years of political turmoil is faltering ahead of presidential elections planned for later this month, in a statement Friday, May 16, 2014. His Carter Center won’t be sending observers for Egypt’s May 26-27 election, which many believe retired Field Marshal Abdel-Fattah el-Sissi handily will win following the overthrow of Islamist President Mohammed Morsi last year that he led. (AP Photo/Thomas Hartwell, File )

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President Jimmy Carter tells newsmen of his submarine ride aboard the nuclear submarine U.S.S. Los Angeles, May 28, 1977. Adm. Hyman Rickover, left, who accompanied Carter on the all-day cruise, stands by. In background is the conning tower of the submarine.

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U.S. President Jimmy Carter maneuvers the nuclear submarine U.S.S. Los Angeles at the wheel off the coast of Port Canaveral, Florida, Friday, May 27, 1977, while Admiral Hyman Rickover (behind Carter) looks on. (AP Photo)