Republican Jeff Flake and Democrat Richard Carmona will square off in a debate Wednesday in the race to fill the U.S. Senate seat being vacated by retiring Sen. Jon Kyl.

The two will appear together at 5 p.m. in a one-hour forum on KAET-TV, the PBS affiliate in Phoenix. Watch the debate here via live stream.

A second forum is set for Monday in Tucson, scheduled for airing on PBS 6, KUAZ 89.1 radio and at at 6 p.m.

The two also will meet Oct. 25 at a forum in Yuma.

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