Arizona Sen. John McCain lends support Sunday in Centennial, Colo., to a fellow Republican, former Colorado Lt. Gov. Jane Norton, in her bid for the party's senatorial nomination in Tuesday's primary.
Senate Armed Services Committee Chairman Sen. Carl Levin, D-Mich., left and the committee's ranking Republican Sen. John McCain, R-Ariz., right, question Marine Corps Gen. James Mattis, center, on Capitol Hill in Washington, Tuesday, July 27, 2010, during the committee's hearing on Mattis' nomination to head the U.S. Central Command. (AP Photo/Alex Brandon)
The Senate Armed Services Committee's ranking Republican, Sen. John McCain, left, R-Ariz., left, accompanied by fellow committee members, Sen. Joseph Lieberman, I-Conn., and Sen. Lindsey Graham, R-S.C., walk to a news conference on Capitol Hill in Washington, Wednesday, June 23, 2010, to discuss the confirmation hearings for Gen. David Petraeus. (AP Photo/Alex Brandon)
Senate Armed Services Committee members, from left, Sen. John McCain, R-Ariz., the committee's ranking Republican, Sen. Lindsey Graham, R-S.C., and Sen. Joseph Lieberman, I-Conn., take part in a news conference on Capitol Hill in Washington, Wednesday, June 23, 2010, to talk about confirmation hearings for Gen. David Petraeus. (AP Photo/Alex Brandon)
Sen. John McCain, seen at a May 17 Senate hearing, disagreed Thursday with objections to boosting a program that jails illegal immigrants briefly rather than immediately releasing them across the border. (Associated Press)
John McCain is greeted by President Nixon in Washington in September 1973, after Mr. McCain spent more than five years in a Vietnamese prisoner-of-war camp known as the "Hanoi Hilton."
**FILE** Sarah Palin's supporters brandish signs of her depicted as feminist icon Rosie the Riveter while waiting to see Mrs. Palin and Sen. John McCain on Sept. 9, 2008, at a rally at Franklin & Marshall College in Lancaster, Pa. (Associated Press)
The Xcel Energy Center in St. Paul, Minn., is where speeches will be delivered and Sen. John McCain's nomination formalized, but around it is an inviting metropolitan area to explore. (Associated Press)
Seen here at a Senate hearing in December 1992 long before either ran for president, Sen. John Kerry (left) listens to Sen. John McCain. Mr. Kerry offered Mr. McCain the No. 2 spot on his ticket in 2004, but now says he is not fit for the White House.