NEW YORK —

President Donald Trump's request to add a documentary proof of citizenship requirement to the federal voter registration form cannot be enforced, a federal judge ruled Friday.

Video above: New voters will face new requirements to register in New Hampshire

U.S. District Judge Colleen Kollar-Kotelly in Washington, D.C., sided with Democratic and civil rights groups that sued the Trump administration over his executive order to overhaul U.S. elections.

She ruled that the proof-of-citizenship directive is an unconstitutional violation of the separation of powers, dealing a blow to the administration and its allies who have argued such a mandate is necessary to restore public confidence that only Americans are voting in U.S. elections.

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