A federal judge on Friday blocked an effort by U.S. President Donald Trump’s administration to require documentary proof of U.S. citizenship to register in the federal voter database.

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Judge Colleen Kollar-Kotelly of Washington ruled in favor of Democratic and civil rights groups that had challenged the executive order Trump signed in March on election regulations. The president—who has repeatedly alleged that noncitizens have voted illegally in the U.S.—sought to impose the new requirement.

Kollar-Kotelly found that Trump lacked the authority to enact such a measure, noting that this power rests with the states and Congress. She further ruled that his order demanding proof of citizenship—such as a passport or government-issued ID—to register to vote violated the separation of powers.

The decision, which follows a temporary injunction previously issued by the same judge, marks another setback for Trump and his allies, who have long alleged that large numbers of undocumented immigrants have voted in U.S. elections.

In reality, documented cases of noncitizens committing voter fraud in the United States are exceedingly rare.

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