The Michigan Supreme Court will hear oral arguments for a lawsuit about a ballot proposal to change how Michigan draws political districts.

Voters Not Politicians is the group behind the measure, which would put a 13-member commission in charge of redistricting, instead of the state Legislature. It says the proposal meets all the requirements of a voter-initiated constitutional amendment. But a group opposed to the measure, Citizens Protecting Michigan’s Constitution, disagrees. It says the proposal goes beyond what’s allowed for this type of ballot proposal.

The Michigan Court of Appeals recently ordered a state elections board to approve the measure for the ballot. That’s when Citizens Protecting Michigan’s Constitution appealed to the Supreme Court.

The court will meet on July 18.