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WASHINGTON - OCTOBER 27:  Sen. John McCain (R-AZ) hold a news conference to announce the introduction of "The Post-9/11 Troops to Teachers Enhancement Act" at the U.S. Capitol October 27, 2009 in Washington, DC. The bill will expand the Troops to Teachers program by reducing length of military service requirements for participants, expanding the number of school districts at which troops may receive a stipend to teach and other changes.  (Photo by Chip Somodevilla/Getty Images)
WASHINGTON - OCTOBER 27:  Sen. John McCain (R-AZ) hold a news conference to announce the introduction of "The Post-9/11 Troops to Teachers Enhancement Act" at the U.S. Capitol October 27, 2009 in Washington, DC. The bill will expand the Troops to Teachers program by reducing length of military service requirements for participants, expanding the number of school districts at which troops may receive a stipend to teach and other changes.  (Photo by Chip Somodevilla/Getty Images)

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Sen. John McCain talks to Jake Tapper about the growing North Korea threat and how the United States should respond.

McCain open to nuclear weapons for South Korea

Sen. John McCain talks to Jake Tapper about the growing North Korea threat and how the United States should respond.