Sen. John McCain Announces He's Running for 6th Term

McCain, 78, will be 80 by Election Day, but jokes that his Senate career is "just getting started."

Fun fact of the day: John McCain's Arizona Senate seat was previously held by Barry Goldwater

U.S. Sen. John McCain has announced he will run for re-election in 2016.

The Arizona Republican made the announcement to run for a sixth term on Monday in an interview with NBC News. He is the chairman of the Senate Armed Services Committee.

McCain uses his position as chairman to criticize President Barack Obama on national security.