The Arizona Republic reports that a Pima County Superior Court judge on Monday denied rival pretrial motions by the municipalities and by the state for summary judgment.
The motions asked Judge James Marner to either overturn the law or dismiss the cities’ suit.
Marner said conflicting evidence presented by the state and cities regarding voter turnout and cost savings needs to be heard in court.
The new law takes effect in 2014. It affects roughly half of the 70 municipalities in the state.
The lawsuit was originally filed by Tucson and Phoenix later joined the case.