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U.S. District Judge David O. Carter on Wednesday rejected the Justice Department's emergency request to force California to set aside mail-in ballots associated with more than 20,000 registered voters whose citizenship the Trump administration has questioned, ruling that the last-minute intervention would disrupt an election already underway.

The over 20,000 voters identified by Department of Justice officials as "likely aliens" were designated as such after Homeland Security Investigations and federal partners "used multiple data-enrichment and verification methods" to flag potential noncitizens on California’s voter rolls.…