The Justice Department sent letters warning election officials in all 50 states and the District of Columbia that they could face criminal prosecution over noncitizen voting, a spokesperson for the Justice Department confirmed Tuesday.

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The letters, signed by Assistant Attorney General Harmeet Dhillon, who heads up the department’s Civil Rights Division, give states five days to explain how they will comply with federal voter eligibility laws and how they will maintain “clean voter lists.”

“The Department sent these letters to all 50 states and the District of Columbia, asking for voluntary compliance in a timely manner with their obligations under federal law to ensure only citizens vote in federal elections,” a Justice Department spokesperson said in a statement.

Noncitizen voting in federal elections is extremely rare, but Trump and his administration have falsely portrayed it as a widespread issue.

Michigan Secretary of State Jocelyn Benson, Nevada Secretary of State Francisco Aguilar and Utah Lt. Gov. Deidre Henderson are among those who said they received the letters from the Justice Department.

The letters say state election officers “could be criminally prosecuted for aiding and abetting” noncitizen voting. They further specify that any election officer who knowingly retains noncitizens on a statewide voting registration list or who facilitates noncitizens’ receiving and casting ballots could be subject to criminal liability.

“An intentional act that is aimed at diluting the votes of citizens could also constitute a violation” of federal law, the letters said.

Henderson wrote on social media that the threats constitute “truly bizarre behavior.”

“Got another love letter this morning from the DOJ sprinkled throughout with threats of criminal prosecution,” she wrote. “I’m sure I’m not the only chief election officer of a state who is being targeted for following state and federal laws by resisting DOJ’s demands for private voter data that have thus far been ruled illegal by at least a dozen courts.”

The letters are the latest move in the Justice Department’s campaign to assert more federal control over state elections.

While some states have complied with the administration’s demands that they hand over voter roll data, the Justice Department has sued 30 states and Washington, D.C., for resisting. So far, 11 different federal courts have dismissed the Justice Department’s efforts to seize voter rolls.