PHOENIX (AP) — A judge is refusing to block the Arizona Clean Elections Commission from investigating Arizona Attorney General Tom Horne for alleged election law violations.

Maricopa County Superior Court Judge Dawn Bergin ruled on Tuesday against the Republican's request for an injunction blocking the commission's investigation.

Horne's attorneys argued at an Aug. 11 hearing that the commission lacks the authority to investigate his re-election campaign because he's running with private funding. Bergin's ruling said the commission does have the authority.

Horne wanted the commission's investigation of a complaint filed by former staffer Sarah Beattie blocked. She alleges that Horne was using his executive staff to run his re-election campaign on state time.

Horne denies wrongdoing.

Horne is locked in a tough primary fight with Horne with former Gaming Department director Mark Brnovich.