Arizona Attorney General Thomas C. Horne told the Supreme Court on Monday that states carry the “burden” of determining voter eligibility and they can demand that residents prove their citizenship before registering to vote.

Conservative-leaning Justice Antonin Scalia seemed to agree with Arizona, saying a sworn oath of citizenship “is not proof at all.”

Arizona and its supporters — including other states with plans for similar laws — say a signature isn’t enough to combat voter fraud. And they argue the federal voting-rights law doesn’t say that states can’t impose additional citizenship requirements.

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