The U.S. Supreme Court is set to review an Arizona voting rule that requires some voters to provide documentary proof of U.S. citizenship when registering to vote. Multiple outlets report that the Court agreed to hear the dispute over whether Arizona’s proof-of-citizenship requirement, implemented through a state-designed voter registration process, violates federal voting law.

The challenge centers on the interaction between state voting procedures and federal requirements governing voter registration and eligibility. Supporters of the Arizona approach argue that states may require verification of citizenship as part of voter registration. Opponents contend that the requirement conflicts with federal statutes or the standards that states must follow when implementing federal election rules.

NBC, Bloomberg, and CBS all describe the issue as a legal question about the validity of Arizona’s proof-of-citizenship documentation requirement under federal law. The Court’s decision will determine whether Arizona may continue using the requirement in its voter registration system.