A federal judge rules that a revamped federal tool used by some state election officials to identify potentially illegally registered noncitizen voters is unlawful and cannot continue to be used. The ruling centers on the tool’s use of federal information to check citizenship status, which election officials have relied on as part of a broader effort to improve voter list accuracy and remove ineligible registrations.

According to the court, the database-based process poses a risk of incorrectly flagging voters and could lead to improper purges of eligible voters. The judge therefore blocks the tool’s use going forward. The decision applies to the use of the specific federal system at issue, which has been described as central to the election-related strategy associated with the Trump administration.

The reported outcome is a restriction on the tool’s deployment while the legality of its methods is being challenged. Other details about which states participated, the scope of the order, and next steps for the case are not provided in the excerpts.