KANSAS CITY, Kan. (AP) — A federal judge is considering whether to temporarily block Kansas from enforcing its proof of citizenship requirement for people who register to vote at state motor vehicle offices.

U.S. District Judge Julie Robinson on Thursday took the case under advisement after hearing four hours of arguments in Kansas City, Kansas.

The American Civil Liberties Union says the state’s proof-of-citizenship law violates the National Voter Registration Act. The federal law, also known as the “motor-voter law,” is aimed at increasing voter participation by requiring states to allow voters to register when they get a driver’s license.

Secretary of State Kris Kobach argued Thursday that the NVRA applies only to federal elections, and a temporary injunction would force the state to create a separate voting tier for those registering at the DMV.

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KANSAS CITY, Kan. (AP) — The American Civil Liberties Union is in court challenging a Kansas law requiring proof of citizenship when people register to vote at state motor vehicle offices.

U.S. District Judge Julie Robinson is hearing arguments Thursday in Kansas City, Kansas, on whether to temporarily block the state from requiring the citizenship documentation until the case goes to trial.

The ACLU contends the requirement violates the National Voter Registration Act, a federal law that aims to increase voter participation by eligible citizens. That law is sometimes called the “motor-voter law” because of a provision requiring states to provide voter registration services in conjunction with drivers’ license applications.

Secretary of State Kris Kobach has championed documentation requirements to prevent voter fraud. Critics contend it deprives eligible voters of the right to vote.