US Senator, War Hero John McCain Dead at 81

U.S. Republican presidential nominee Senator John McCain (R-AZ) speaks at a campaign rally in Defiance, Ohio October 30, 2008.

John McCain (Bottom R) poses with his U.S. Navy squadron in 1965.

A black and white photograph taken in 1967 of then captured navy pilot John McCain is shown as part of an exhibit on American prisoners of war in Hanoi's Hoa Lo prison April 28.

U.S. Navy Lt. Comdr. John S. McCain is interviewed about his experiences as a prisoner of war during the war in Vietnam, April 24, 1973.

U.S. President Richard Nixon greets former Vietnam prisoner of war John McCain at a pre-POW dinner reception in Washington, May 24, 1973.

President George Bush addresses reporters at the White House, October 23, on the release of documents by Hanoi on Americans missing in Southeast Asia.

Arizona Senator and Republican presidental hopeful John McCain looks up while speaking with his campaign manager Rick Davis (L) and national political director John Weaver during a flight from South Carolina to California February 4.

Republican presidential candidate Arizona Senator John McCain (R) listens to advice from his campaign staff onboard his bus as his wife Cindy (L) looks on near Concord, New Hampshire January 25.

US Republican presidential candidate Senator John McCain (R-AZ) and his running mate Alaska Governor Sarah Palin hug during a campaign stop in O'Fallon, Missouri August 31, 2008.

U.S. Republican presidential nominee Senator John McCain (R-AZ) (L) and U.S. Senator Joe Lieberman (I-CT) point to a sign in the crowd at a campaign rally in Grand Junction, Colorado November 4, 2008, the day of the U.S. presidential election.

Sen. John McCain heads to the Senate floor ahead of votes on Capitol Hill in Washington, U.S., December 6, 2017.

FILE - Sen. John McCain, R-Ariz., speaks to reporters on Capitol Hill in Washington.