A new lawsuit seeks to stop same-day voter registration at the polls in Illinois' largest counties.
All voters in the state can register on Election Day at the courthouse or election office.
But only voters the 20 counties that have more than 100,000 people can register at the polls on Election Day.
Jacob Huebert, senior attorney at the Liberty Justice Center, said that's unfair.
"The Supreme Court has made it clear,” Huebert said. “You can't discriminate against some voters based on where they live. But that's exactly what this statue does."
Huebert filed a federal lawsuit to strike down same-day registration at the polls. Same-day registration at election offices could continue.
"What we are challenging is (same-day registration) at polling places," Huebert explained. "If you can go to your polling place and register and vote, that's a whole lot easier than going to some other place and registering and voting."
Illinois tested same-day registration in 2014. The State Board of Elections said 18,000 people voted on the same day that they registered.
Same-day voting for this year's primary exploded to 110,000 ballots cast.
Huebert is asking the court to order that same-day registration at the polls be ended for the November election.
The Liberty Justice Center is a partner to INN's parent organization, Illinois Policy Institute.