Terry Ashe / Getty Images John McCain (center) sits as a young boy with his grandfather Vice Adm. (later admiral) John S. McCain Sr. (left) and father, Cmdr. (later admiral) John S. McCain Jr., in a family photo, in the 1940s. Public Domain John McCain (front right) with his squadron in 1965. AP Navy crew members try to put out a fire aboard the USS Forrestal in the Gulf of Tonkin off the coast of Vietnam on July 29, 1967, after an F-4 Phantom accidentally fired a Zuni rocket into an A-4 Skyhawk, which caused massive explosions on the aft end of the flight deck. McCain was injured during the incident that killed 134 sailors. AFP / Getty Images McCain (center) is rescued from Hanoi's Truc Bach Lake by several Hanoi residents after his Navy warplane was downed by the North Vietnamese Army on Oct. 26, 1967. AFP / Getty Images McCain is examined by a Vietnamese doctor in 1967. Bettmann Archive / Getty Images President Nixon speaks with Adm. John S. McCain, commander in chief of US forces in the Pacific, whose son is a prisoner of war in Vietnam. AFP / Getty Images McCain lying on a bed in a Hanoi hospital as he was being given medical care for his injuries in 1967. Horst Faas / AP McCain is escorted by Lt. Cmdr. (later captain) Jay Coupe Jr., public relations officer, on March 14, 1973, to Hanoi's Gia Lam Airport after the POW was released. Photoquest / Getty Images At a predinner reception, US President Richard Nixon greets McCain in Washington, DC, on May 24, 1973. Cynthia Johnson / Getty Images Vice President George H.W. Bush (right) swears in John McCain as US senatorfrom Arizona in 1987, with his family watching on. Robert Giroux / AFP / Getty Images Sen. John Kerry, who received three Purple Hearts while serving in Vietnam, and Sen. John McCain, who was a POW in Vietnam from 1967 to 1973, examine a book containing the names of the "unaccounted for" soldiers who served in the Vietnam War, on June 24, 1992. Hoang Dinh Nam / AFP / Getty Images McCain holds up photos of himself outside the Vietnam Military History Museum in Hanoi on Oct. 19, 1992. The photos were delivered by Col. Pham Duc Dai (left), director of the museum, and Col. Tran Bien (right), representative on the MIA issue at the Ministry of Defense, as a gift for visiting the museum. Hoang Dinh Nam / AFP / Getty Images McCain looks at a display of personal belongings of American POWs at the joint POW/MIA archives center in the Vietnam Military History Museum on May 31, 1993. Boston Globe / Getty Images McCain gets a haircut in his hotel before the Republican National Convention begins in San Diego on Aug. 12, 1996. New York Daily News Archive / Getty Images Presidential hopeful Sen. John McCain gets a kiss from his wife, Cindy, as they kick off his campaign in Greenville, South Carolina, on July 31, 1999. Brian Snyder / Getty Images McCain, then a Republican presidential candidate, talks with a supporter at a book signing for his book Faith of My Father in Manchester, New Hampshire, on Sept. 11, 1999. Mike Fiala / Getty Images Supporters of McCain gather outside the venue of the GOP debate on the campus of Arizona State University in Tempe, Arizona, on Nov. 21, 1999. C.j. Gunther / AFP / Getty Images McCain, then a Republican presidential hopeful, gives his wife Cindy a kiss prior to his final town meeting on Jan. 30, 2000, in Peterborough, New Hampshire. David Hume Kennerly / Getty Images In his suite at the Crowne Plaza Hotel, Republican presidential contender McCain hugs his daughter Meghan, with his wife, Cindy, behind them, after hearing that he's the projected winner of the Republican New Hampshire primary on Jan. 8, 2008, in Nashua, New Hampshire. Brooks Kraft / Getty Images President George W. Bush talks with McCain at a Republican Party fundraiser in Paradise Valley, Arizona, on Oct. 12, 2004. Darren Hauck / Getty Images McCain and former Alaska governor Sarah Palin attend a campaign rally at the Pima County Fairgrounds on March 26, 2010, in Tucson, Arizona. AFP / Getty Images McCain, the Republican presidential candidate, and Democratic presidential candidate Barack Obama take part in the first presidential debate at the University of Mississippi in Oxford, Mississippi, on Sept. 26, 2008. Brian Snyder / Reuters Republican presidential nominee McCain, with his wife, Cindy, speaks at a campaign rally at Saint Anselm College in Manchester, New Hampshire, on Oct. 22, 2008. Alex Wong / Getty Images McCain speaks to members of the media after a hearing on the Benghazi attack before the Select Committee on Intelligence on Nov. 16, 2012, on Capitol Hill. William Thomas Cain / Getty Images McCain makes remarks after receiving the 2017 Liberty Medal at the National Constitution Center on Oct. 16, 2017, in Philadelphia. Aaron Bernstein / Reuters McCain, recently diagnosed with an aggressive form of brain cancer, departs after returning to the Senate to vote on health care legislation on Capitol Hill on July 25, 2017. Carolyn Kaster / ASSOCIATED PRESS McCain speaks at a rally outside Raymond James Stadium in Tampa, Florida, on Nov. 3, 2008.