Supreme Court allows revamped federal voter-eligibility database to be used for now
The dispute pits election-integrity checks against concerns that rushed citizenship matching could wrongly remove eligible voters.
What happened
The Supreme Court allowed states, for now, to use a revamped federal database intended to help check voter eligibility before the midterms. The system is part of the administration's effort to identify noncitizens who may be registered.
Republican / administration case
Republicans supporting the system say citizenship verification is a basic election-integrity measure and that states should have access to federal data that can identify ineligible registrations.
Democratic / critic case
Democrats and voting-rights advocates argue that noncitizen voting is already extremely rare and warn that database matching errors could improperly flag eligible citizens close to an election.
Libertarian / Cato case
Cato election-policy writers have argued that documented noncitizen voting is extremely rare and have criticized federal attempts to override states' constitutional role in running elections. Their concern combines federalism, accuracy and due process.
Where the disagreement really is
There is broad agreement that only eligible citizens should vote. The fight is over how large the problem is and how much risk of false positives is acceptable in trying to prevent it.