A federal judge late Monday temporarily barred the Justice Department and Department of Homeland Security from sending states lists of registered voters whom the administration suspects are not U.S. citizens, or pressing election officials to hold back those voters’ ballots. The order, issued on the eve of the Nov. 3 midterm elections, interrupts a federal effort that had already produced demands in several states and a growing set of lawsuits over who controls voter eligibility decisions, according to Reuters.

U.S. District Judge Tanya Chutkan’s ruling in League of Women Voters v. Department of Homeland Security is temporary. It does not establish that every person on a federal list is eligible to vote, nor does it prevent prosecution of a proven violation of the federal ban on noncitizen voting. It instead limits how federal agencies may distribute disputed lists and ask states to change ballot procedures while the case proceeds.

The administration says its program enforces federal law and protects legal voters. The plaintiffs argue that rushed list matching can misidentify citizens, violate privacy and interfere with state authority at the most sensitive point in the election calendar.

The order changes the immediate federal approach

The court’s order stops the agencies from sending suspected-noncitizen voter lists to states and from asking state officials to segregate or decline to count ballots until citizenship is proved. That is broader than resolving a dispute about one group of ballots because it restricts the transmission and use of the lists themselves.

State officials can still apply their own registration, challenge and provisional-ballot procedures, and federal authorities retain ordinary tools to investigate evidence of an actual crime. The temporary order prevents the contested lists from driving last-minute departures from those processes. An appeal or later merits decision could alter that boundary.

A citizenship initiative became a list-matching campaign

The policy traces in part to a March executive order directing DHS, working with the Social Security Administration, to compile state citizenship lists from federal records. The order instructed agencies to create correction procedures and transmit updated lists before federal elections, while stating that an individual’s appearance on a citizenship list would not itself establish registration eligibility under state law.

The operation challenged now evolved differently: federal officials obtained voter-roll information and matched it against immigration, citizenship and other databases to identify people believed to be noncitizens. A separate Reuters review reported that the Justice Department had acknowledged sending letters to five states by Oct. 30, while DHS had obtained at least partial voter data from at least 47 states. Some states cooperated; others refused or contested the demands in court.

The models carry different risks. A list of suspected noncitizens can trigger adverse action against named voters, making false matches especially consequential. The litigation focuses on that process and on what agencies may do with its output.

A court-filed analysis by two UCLA data scientists illustrates the dispute. Reviewing a Justice Department file of 20,930 names in separate California litigation, the experts said 8,880 names, or 42 percent, could not be found on the current state voter file using their matching method. They also reported exact matches between the federal list and 22 people identified as citizens by an immigrant-rights organization, plus 66 near-certain matches.

Those findings require care. The declaration came from experts for plaintiffs, not a neutral audit, and concerned one California file. The experts said their copy omitted voter-identification numbers and other fields that could improve accuracy. Their analysis supports concern about immediate use, but does not determine every listed person’s citizenship or voting history.

Washington’s experience points in the same direction. The Justice Department asked the state to set aside possible ballots from 405 people, but state officials said an initial review found canceled or inactive registrations, people with no recent voting history and apparent U.S.-born citizens, the Associated Press reported. Federal prosecutors argued that state verification was necessary precisely because federal access to state records was incomplete.

The case tests federal power and voter privacy

Noncitizen voting in federal elections is illegal. That point is not disputed. The policy disagreement concerns the method of finding violations and the remedy when a database produces a possible match. Federal officials argue that enforcement would be ineffective if states could withhold detailed rolls or ignore credible referrals. States and voting-rights groups respond that eligibility decisions must follow state procedures and federal privacy safeguards, especially when naturalized citizens may appear as noncitizens in older records.

The Constitution gives state legislatures initial authority over congressional election procedures while allowing Congress to change them. Courts are deciding whether executive enforcement power includes directing states to segregate ballots or change list maintenance without new legislation. Chutkan’s order preserves existing state processes while that question remains open.

What the ruling leaves unresolved

The practical effect is immediate but limited. States covered by federal requests may proceed under their existing election rules without acting on the disputed lists merely because federal agencies sent them. Eligible voters remain subject to ordinary identity and registration checks, and anyone who knowingly votes without citizenship can still face federal and state penalties.

The policy fight will continue after Election Day. Courts must decide which federal records may be combined, what correction rights affected people receive, and whether agencies may pressure states based on probabilistic matches. For now, disputed federal data cannot dictate how states handle ballots while courts assess the program’s legality and reliability.