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Supreme Court to weigh Ariz. voter ID law

WASHINGTON — The Supreme Court will struggle this week with the validity of an Arizona law that tries to keep illegal immigrants from voting by demanding all state residents show documents proving their US citizenship before registering to vote in national elections.

The high court will hear arguments Monday over the legality of Arizona’s voter-approved requirement that prospective voters document their US citizenship in order to use a registration form made under the federal ‘‘Motor Voter’’ registration law that doesn’t require such documentation.

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This case focuses on voter registration in Arizona, which has tangled frequently with the federal government over immigration issues involving the Mexican border. But it has broader implications because four other states — Alabama, Georgia, Kansas and Tennessee — have similar requirements, and 12 other states are contemplating similar legislation, officials say.

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