As the billionaire and his allied groups pour more than $20 million into a race for the state’s top court, his car company is suing Wisconsin over a law restricting vehicle sales.

Wisconsin voters go to the polls Tuesday for the state’s Supreme Court election, which is drawing national attention as billionaire Elon Musk spends millions on the high-stakes race, which could have national implications for House races and the 2028 presidential election—and help Musk-owned Tesla.