DES MOINES, Iowa (AP) -

Two Iowans who challenged Libertarian presidential candidate Gary Johnson's listing on ballots in Iowa are taking their case to court. A hearing is set for Friday morning.

Attorneys for the two voters filed documents Thursday in district court in Des Moines asking a judge to review the decision of a panel of three state officials that allowed Johnson on the ballot.

Secretary of State Matt Schultz, Attorney General Tom Miller and Warren Jenkins, the chief deputy for Auditor David Vaudt, voted Wednesday to allow Johnson on November's ballot.

Libertarians say they held a convention at the Iowa State Fair to get Johnson onto Iowa's ballot.

The challengers say Libertarians didn't hold a real convention. They say the panel of officials made an erroneous decision not supported by the evidence.