The Michigan Republican Party and other Republicans have filed a lawsuit challenging the formation of a redistricting commission to draw congressional and legislative lines.
Thursday's suit is the second one brought in under a month.
The party, chairwoman Laura Cox, former Secretary of State Terri Lynn Land and others say a 2018 ballot measure approved by voters violates the GOP's fundamental right to associate or not associate. They fear people who do not represent Republicans' interests will be selected as Republican commissioners.
The constitutional amendment requires that a panel of four self-identified Democrats, four self-identified Republicans and five unaffiliated members draw political maps instead of the Legislature, starting in 2021.
Voters Not Politicians, which spearheaded the anti-gerrymandering change, says it is confident the law will withstand the latest challenge.