President Trump’s Justice Department is turning up the heat on California, launching a criminal investigation into voter rolls and hitting local election officials with grand jury subpoenas in a showdown over more than 20,000 suspected noncitizens.

At least two employees of the Los Angeles County Registrar-Recorder’s office received subpoenas last week ordering them to appear Nov. 4 — the morning after the election — according to records obtained by The New York Times.

In one striking incident, federal marshals served an election official at home despite having already delivered a subpoena at the worker’s office and being notified of legal representation, the outlet reported.

The probe escalates the administration’s battle to stop California from counting ballots tied to people federal officials believe may be ineligible to vote, with US Attorney Bill Essayli warning that disputed ballots could disappear into the final tally.

“We are not seeking to change the rules. As we speak thousands of ballots are being counted. We have a strong interest in election integrity,” Essayli told a packed Los Angeles courtroom Tuesday.

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The Justice Department says more than 20,000 likely noncitizens on California’s voter rolls were sent mail-in ballots. Essayli is seeking an injunction requiring ballots believed to have been cast by noncitizens to be separated, warning that roughly 500,000 ballots have already been counted.

“Every minute that goes by, American citizen votes are being diluted in the state of California,” Essayli said. “It’s an emergency, and we expect the courts to treat it as such.”

California officials dispute the reliability of the federal data used to flag suspected noncitizens, arguing that major changes to voter rolls and election procedures during an ongoing election could disrupt the process.

Meanwhile, new documents have spotlighted a discrepancy involving Los Angeles County. An immigration official swore under penalty of perjury that none of 200 sample names linked to federal records were born in the United States.

US District Judge David O. Carter pushed back against the administration’s demand, warning it “would wreak havoc and disrupt the election that is already underway, create a chilling effect on election workers and voters alike, and discount the votes of United States citizens.”

Carter scheduled a Nov. 13 hearing and said officials have until Dec. 3, the deadline for certifying election results, to resolve the dispute.

The criminal probe comes as Justice Department officials have repeatedly suggested election workers who fail to comply with federal demands could face investigations or prosecution.