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Sen. John McCain, R-Ariz., receives the Liberty Medal from Chair of the National Constitution Center's Board of Trustees, former Vice President Joe Biden, in Philadelphia, on Oct. 16, 2017. The honor is given annually to an individual who displays courage and conviction while striving to secure liberty for people worldwide. McCain died today.

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Former California Governor Ronald Reagan, center, actor Michael Landon, second from right, and the governor's wife Nancy, third from left, greet former POWs during a reunion party in Los Angeles on May 28, 1978. At left, U.S. Navy Capt., Howard Ruttledge and his wife, Phyllis. At right is U.S. Navy Commander John McCain.

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U.S. Rep. John McCain III, R-Ariz., holds a photo of a marker in Hanoi at Truc Bach Lake where he parachuted after being shot down as a Navy pilot in the Vietnam War. McCain, who was a POW for five and one half years in Hanoi, is in Bangkok, Thailand, on Feb. 18, 1985 en route to Hanoi to visit this site. McCain died today.

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John S. McCain III is escorted by Lt. Cmdr. Jay Coupe Jr., public relations officer, March 14, 1973, to Hanoi's Gia Lam Airport after the POW was released.

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U.S. Navy Commander John S. McCain III, a guest of the South Vietnamese government, visits the Holt orphanage in Saigon, Vietnam, on Oct. 30, 1974. The institution cares for many youngsters fathered by American G.I.s. McCain, son of the admiral who commanded U.S. forces in the Pacific at the height of the Vietnam War, was shot down over Hanoi and spent several years as a POW.

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A victorious Sen. John McCain, R-Ariz., right, walks on stage with his wife Cindy McCain, as he waves to hundreds of supporters after his race for U.S. Senate was called against his closest challenger, Democrat Rodney Glassman, on Nov. 2, 2010, in Phoenix.

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Republican presidential candidate Sen. John McCain, R-Ariz., speaks during a rally in Henderson, Nev., on Nov. 3, 2008.

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Sen. John McCain, R-Ariz., right, is joined by Gov. Sarah Palin, R-Alaska, during a rally with supporters on election night in Phoenix on Nov. 4, 2008.

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Senate Armed Services Committee Chairman Sen. John McCain, R-Ariz., speaks on Capitol Hill in Washington on Feb. 9, 2016, during the committee's hearing with Director of National Intelligence James Clapper and Defense Intelligence Agency Director Lt. Gen. Vincent Stewart on worldwide threats.

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U.S. Sen. John McCain visits a refugee centre at the train station in Adasevci, about 62 miles west from Belgrade, Serbia, on Feb. 12, 2016.

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Senate Armed Services Committee Chairman Sen. John McCain, R-Ariz., left, and Vice Chief of Staff of the U.S. Air Force, Gen. Larry Spencer, right, stand for photographs as they honor Retired U.S. Air Force 2nd Lt., John R. Pedevillano, 93, of College Park, Md., center, with the Presidential Unit Citation with one Oak Leaf Cluster during a ceremony on Capitol Hill in Washington, on July 7, 2015. Pedevillano served in the U.S. Army Air Corps as the youngest bombardier in the 306th Bomb Group, flew six combat missions and survived being shot down by Nazi fighter pilots.

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Sen. John McCain clowns around on the podium during sound check the Republican National Convention in Tampa, Fla., on Aug. 29, 2012. McCain died today.