PHOENIX -- Senator John McCain, former U.S. Congressman J.D. Hayworth, and conservative hopeful Jim Deakin will face off in the first of two debates on July 16 in Phoenix. The three candidates are vying for the GOP nomination for the U.S. Senate seat currently held by McCain. The debate will take place at KTVK-3TV Studios in Phoenix on Friday, July 16 at 7:00 p.m and will be simulcast on KTTU in Tucson and azfamily.com. A second debate to be held in Tucson is planned for the following night at KUAT PBS-6.