A trial over a Kansas law critics call illegal that requires proof of U.S citizenship from people registering to vote is set to begin on Tuesday.

The lawsuit, filed in February 2016 in the U.S. District Court in Kansas City, Kansas by the American Civil Liberties Union (ACLU), argues that the state law violates the National Voter Registration Act by requiring voters who do not have a driver’s license to show documents like a birth certificate or U.S. passport for voter registration. It is one of numerous voter ID laws passed by Republican-led state legislatures in recent years.

Democrats have argued that ID laws target voters who typically support the Democratic Party, such as the young and minorities. Proponents of the measures have said they are intended to prevent voter fraud.

Each side in the case will present opening statements on Tuesday, followed by an expected five or more days of testimony. U.S. District Judge Julie Robinson will hear the case.

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