A federal judge has ruled that a revamped federal tool that state election officials have used in their efforts to identify illegally registered noncitizen voters is unlawful and cannot be used.

A federal judge on Monday ruled that a recently revamped version of a federal tool central to the Trump administration’s election integrity strategy is unlawful and can no longer be used.

U.S. District Court Judge Sparkle L. Sooknanan sided with advocacy groups that argued the recent upgrades to the program, called Systematic Alien Verification for Entitlements, or SAVE, aggregated Americans’ sensitive personal data in a way that could result in voters being wrongly purged from voter rolls.

“All in all, the federal government has knowingly trampled on the privacy rights of American citizens in a manner that threatens the sacred right to vote,” Sooknanan said in an order explaining the decision. “This Court cannot stand idly by while that happens.”