Hoping to breathe life into his struggling campaign challenging Arizona Sen. John McCain, former Rep. J.D. Hayworth on Monday pledged to serve just two terms while fighting illegal immigration and government regulations.

U.S. Sen. John McCain is spending money like his political life depends on it, pouring more than $15 million into his primary challenge against J.D. Hayworth.

Sen. John McCain has squared off in a sometimes testy debate with a former Arizona congressman hoping to take his job. J.D. Hayworth portrayed McCain Saturday night as a flip-flopper on illegal immigration, while McCain painted his rival as a faux conservative who is lax with tax dollars.

Former U.S. Rep. J.D. Hayworth had a much-needed opportunity Friday night to refocus Arizona's Republican Senate primary on incumbent John McCain, and he came out swinging.

A new poll shows Arizona Sen. John McCain leading his Republican challenger. The Rocky Mountain Poll released on Wednesday shows McCain leading former congressman J.D. Hayworth 64 percent to 19 percent. Political newcomer Jim Deakin had 5 percent.

J.D. Hayworth is launching his first television ad targeting Sen. John McCain in their Republican primary fight.

Sen. John McCain is taking heat from a television infomercial star famous for hawking free government money, who is angry that the Arizona senator used him in a campaign ad without permission.

John McCain's Republican primary challenger says a newly discovered video reveals that McCain had a closer relationship with a disgraced donor than the Arizona senator has let on.

Six months of trying to outflank Sen. John McCain from the right produced less support, less money, fewer endorsements and lower poll numbers than J.D. Hayworth and his dedicated followers had anticipated.

John McCain's Republican primary challenger said Thursday he regrets taping an infomercial on behalf of a company accused of taking advantage of consumers.