Election officials in some of America’s largest counties say a federal citizenship-check database revived by the Supreme Court will have little impact on the November 3 midterm elections.

The high court on September 25 allowed states to resume using the Department of Homeland Security’s SAVE database to check voters’ citizenship, after access was blocked in June. But the decision restored searches for specific voters rather than broad roll overhauls — and federal law discourages sweeping voter-roll changes within 90 days of an election.

“Restarting it now, from our expert view, it does not look to have much impact on this election,” Aaron Blacksberg of the Institute for Responsive Government told reporters on September 30.

The decision came as the Justice Department fights dozens of cases seeking state voter lists to compare against the database. Judges have ruled against the department in 25 district courts and one appeals court, with some calling the database flawed and “unreliable” for identifying non-citizens.

Federal officials announced 10 voter-fraud indictments in Minnesota on September 30. Studies have found few non-citizens vote.