(NBC NEWS) The Supreme Court on Monday struck down an Arizona law that requires people to submit proof of citizenship when they register to vote.

The vote was 7-2, with Justice Antonin Scalia writing for the court. Justices Clarence Thomas and Samuel Alito, two members of the court’s conservative wing, dissented.

Several states said that such a law reduces voter fraud, but civil rights groups said it was an effort to discourage voting by legal immigrants. The case was argued and decided at a time when the country is considering how to change its immigration laws.

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