The high court will combine two lower court challenges, one filed by the NAACP and Voces de la Fontera, the other by the League of Women Voters.
Wisconsin's Photo ID rule requires voters to present a government-issued ID card. However, the state has not enforced the law since its passage in 2011, because a Dane County judge declared it unconstitutional.
He ruled in the case the Milwaukee NAACP and Voces de la Frontera filed. The state appealed his decision, and appeals court was scheduled to listen to arguments on Dec. 17.
The Wisconsin Supreme Court is grabbing the case and will merge it with the one the League of Women Voters is pursuing against Photo ID. The League won its case in circuit court but lost in appeals court, so the group wants the high court justices to rule.
While the state court battles continue, federal court in Milwaukee is considering constitutional challenges to Wisconsin's Photo ID law.