U.S. Sen. John McCain says he will run for re-election.
The Arizona Republican tells NBC News in an interview that he plans to run for a sixth term in 2016. He is the chairman of the Senate Armed Services Committee.
Tea party groups see him as a top challenge in a primary. Conservatives have criticized him as too moderate. The 78-year-old will be 80 by Election Day, but he says his Senate career is only beginning.
McCain ran for president in 2008.