States are vowing to go to the courts for permission to ask newly registered voters to show proof of citizenship after a federal commission ruled on Jan. 17 that it’s up to the national government, not states, to decide what to include on registration forms.

Under the motor-voter law, federal officials distribute voter-registration forms in all of the states. Arizona, Kansas and Georgia all asked that those forms request proof of citizenship, but the federal Election Assistance Commission rejected that in a 46-page ruling released late Friday, just ahead of a court-imposed deadline.

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