President Donald Trump said Monday that he plans to urge the Justice Department to investigate a major mail ballot mistake in Maryland, alleging without evidence that the issue involved election fraud.

Maryland election officials announced they are sending out approximately 500,000 replacement mail ballots after discovering that some voters were mistakenly mailed primary ballots tied to the wrong political party because of a vendor-related printing problem. Since officials could not identify exactly which voters received incorrect ballots, the state opted to resend ballots to all potentially impacted voters.

Trump addressed the situation Friday in a Truth Social post, writing: “In Maryland, they sent out 500,000 Illegal Mail In Ballots, and they got caught! So now, they’re going to send out 500,000 more Mail In Ballots, but nobody knows what’s happening with the first 500,000 they sent.”

State election officials have stated that the original ballots will not be counted and will instead be isolated and invalidated. Only the newly issued ballots will be accepted in the election.

“There is no risk of duplicate voting as a result of this issue. Election officials have safeguards in place to ensure that only one ballot can be accepted per voter. Every return envelope/oath has a unique identifier to ensure that a voter can only vote one ballot. SBE has implemented additional safeguards to ensure only the correct ballot is counted for each voter,” the board said in a release Monday.

According to Maryland officials, the problem originated with a printing contractor, which will cover the cost of reissuing the ballots. The state’s primary election is scheduled for June 23.

Trump’s demand for a federal investigation marks his latest criticism of mail-in voting, an issue he has repeatedly targeted while alleging widespread election misconduct. Earlier this year, Trump signed an executive order aimed at tightening rules surrounding voting by mail.

In the same Truth Social message, Trump also referred to Maryland Gov. Wes Moore as “corrupt.”

Ammar Moussa, a spokesman for Moore, sharply criticized Trump’s comments and dismissed the allegations.

“Marylanders should look to the State Board of Elections for accurate information — not social media misinformation designed to undermine confidence in our elections,” Moussa said.