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“Gov. Doug Ducey of Arizona has signed legislation requiring voters to prove their citizenship in order to vote in a presidential election, swiftly drawing a legal challenge from voting rights activists who argued that it could keep tens of thousands of voters from casting a ballot.

The Arizona measure, passed into law on Wednesday, also requires newly registered voters to provide a proof of address, which could have a disproportionate impact on students, older voters who no longer drive, low-income voters and Native Americans.

Legal experts said the new rules might run afoul of both federal law and recent Supreme Court decisions. On Wednesday, Mi Familia Vota, a voting rights group, filed a federal lawsuit challenging the law.”

“It certainly is attempting to undo the Arizona v. I.T.C. decision,” said Jon Greenbaum, chief counsel for the Lawyers’ Committee for Civil Rights Under Law, referring to the 2013 Supreme Court decision. “And maybe part of this is thinking you’ve got a new Supreme Court now, and that Supreme Court may look at things differently.”

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