Minnesota State Auditor Rebecca Otto says she'll appeal her case over a state law allowing counties to hire private firms for financial audits to the Minnesota Supreme Court.

Minnesota State Auditor Rebecca Otto says she'll appeal her case over a state law allowing counties to hire private firms for financial audits to the Minnesota Supreme Court.

Minnesota's Court of Appeals on Tuesday upheld the controversial 2015 law in a 2-1 ruling. It's the second such decision, following a district court's ruling last year that the change was constitutional.

Republicans behind the change argued counties can get cheaper audits through private firms. But Otto says it's an unconstitutional breech of her duties.

Otto said Tuesday she plans to take the case to the state's highest court. She has spent more than $250,000 fighting the law so far.

Republican Rep. Sarah Anderson said an appeal to the Supreme Court "would serve no purpose other than to waste taxpayer dollars."