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.

Only a handful of states have similar laws, which the states say are meant to reduce voter fraud, but civil rights groups worried that more states would have followed if the Supreme Court had upheld the Arizona law. Those groups say the Arizona law was an effort to discourage voting by legal immigrants.

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