A ruling from a Waukesha County judge requires the Wisconsin Election Commission to review the state's voter list and check if any registered voters are not U.S. citizens.

The state Department of Justice is expected to appeal the order on behalf of the state's bipartisan elections agency, which raised concerns about their ability to verify the citizenship of 3.6 million registered voters before the Feb. 17 election.

The ruling is a win for Republicans who have sought to scrutinize voters' citizenship status. Under federal law, noncitizens can't vote in U.S. elections. There are very few cases of voter fraud tied to citizenship in Wisconsin.

Here's an explanation of the judge's order and whether Wisconsinites are required to prove their citizenship when registering to vote.

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