(WASHINGTON) -- Department of Homeland Security Secretary Markwayne Mullin threatened on Friday to strip states of federal election-related aid, and to possibly seek criminal penalties against election officials, if they don't comply with the administration's voting roll probe ahead of the midterms.

Mullin told reporters that if states want to continue to receive federal reimbursement "to run federal elections," they must now cooperate with DHS's efforts to "scrub" their voter rolls and update the security of their election systems.

"We're saying that the machines had to be secure, and that your voter registration list needs to be scrubbed," Mullin said in a news conference.

It was not immediately clear what grants or funding could be in jeopardy for non-compliant states. DHS has previously threatened to withhold Federal Emergency Management Agency counterterrorism grants unless states complied with election security mandates.

"If states want the grant funding, to recap, they must secure the election," Mullin said.

Mullin's news conference came one day after President Donald Trump's primetime speech on elections, in which he announced he was declassifying a slew of documents he claims reveal vulnerabilities in America's elections systems and foreign interference, particularly by China.

Mullin, who was sworn in as DHS secretary on March 24, claimed America's adversaries have the "key to the back" of American voting machines, alleging that bad actors could change the registration of voters -- and even manipulate votes that have already been cast.

But Mullin offered no evidence that foreign vote manipulation has occurred, nor did he elaborate on how it is possible.

Mullin also argued, as Trump did on Thursday night, that America's elections are also vulnerable because of noncitizen voters being on the voter rolls.

A DHS report released overnight alleged more than 250,000 noncitizens are on voter rolls in four states.

Mullin did not provide more information on how DHS arrived at the claim that 250,000 noncitizens are registered to vote in California, Pennsylvania, New Jersey, and Nevada, saying only it was pulled from public voter records.

The Department of Justice attempted to compel states to turn over their voter files, and sued more than two dozen that refused to do so. But courts have thrown out those lawsuits across the board, saying the DOJ lacks a compelling reason for the data.

Mullin said it would be a "little bit tougher" to obtain data from those states.

He said DHS will continue to comb through voter rolls in search of noncitizens and others ineligible to vote, and threatened them with jail time and or financial penalties.

"We will scrub all election records, looking for illegal aliens and those who are ineligible to vote, including those that somehow voted, yet they were deceased," Mullin said.

"If you're illegal and attempted to vote, or you tried to vote illegally for someone else, we will find you, and we will charge you," Mullin continued. "Illegal voter restoration and illegal voting both carry penalties up to five years in prison and up to $250,000 in fines. We will pursue maximum pressure on this."

The secretary said election officials would be held "accountable" if they don't comply and that the penalties would be extended to them.

"If the election officials, once we gave them the information they need to secure their elections, and they chose not to, then those individuals can also be held accountable by fines, by penalties, and even depending on how far it goes, prison time," he said.

Mullin said DHS will look into the integrity of both early voting and post-Election Day votes during this November's midterm elections.

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