Boston Mayor Michelle Wu may be facing criminal prosecution for the city’s sanctuary policies after the prospect of federal charges was raised by numerous Republican lawmakers who grilled her at a Congressional oversight hearing.

After accusing Wu and three other sanctuary mayors from Chicago, Denver and New York City of “breaking the law” by way of their cities’ limited cooperation with federal immigration authorities, three House Republicans said they were either considering referring them for charges or a Department of Justice probe.

“I’ve been considering referring charges,” U.S. Rep. Gary Palmer, an Alabama Republican, said at Wednesday’s hearing of the GOP-led House Committee on Oversight and Government Reform. “I don’t care who it is, I don’t care what office you hold, we need to abide by the laws passed.”

The prospect of potential charges was raised again by U.S. Rep. Anna Paulina Luna, after the Florida Republican brought up the Boston Trust Act, a 2014 local law that prohibits city and other departments from cooperating with federal authorities on civil immigration detainers.

Luna said Boston’s enforcement of the Trust Act, which she said restricts police communication with federal immigration authorities, was a violation of federal law.

“That is not the truth,” Wu shot back to Luna’s assertion.

After questioning the mayors, Luna said she would be “criminally referring” all four to the U.S. Department of Justice for investigation.

“I’m not doing that in an effort to bully you guys, but I do believe your policies are hurting the American people, and you can make that known with the evidence you can present to the Department of Justice,” Luna said. “If you guys keep doing what you’re doing, you’re not going to help anyone. You’re going to hurt more people.”

Later on, U.S. Rep. Marjorie Taylor-Green, a Georgia Republican, went as far as to accuse the four mayors of committing “treason” with their sanctuary policies.

While not going as far as her Republican counterparts, U.S. Rep. Nancy Mace told the mayors of their sanctuary policies, “You all have blood on your hands,” as others spoke of crimes committed by illegal immigrants.

After the hearing, Committee Chair James Comer, a Kentucky Republican, told reporters there would be “serious consequences” for the mayors, including cuts to federal funding for their cities, if they continue to “obstruct” the deportation of “criminal illegals.”

Comer said, however, that he would leave the prospect of criminal charges and prosecution up to the Department of Justice.

“We investigate, we have public hearings, and the Department of Justice would determine whether or not to prosecute,” Comer said. “Federal funding is at risk if they continue to obstruct.”

Wu, when asked about Republican lawmakers indicating they would pursue criminal charges, said “Boston follows the laws.”

“As we heard throughout the many hours of testimony today, Boston follows the laws,” Wu told reporters, “and I am happy and will make sure that my team continues to follow up with this committee to get them any other information they need.”

U.S. Rep. Ayanna Pressley, a Massachusetts Democrat who previously sat alongside Wu on the Boston City Council, said that while she thought charges would be baseless, she wouldn’t “underestimate “the Trump administration.

“They continue to push the bounds of what is criminality, to stoke the flames of fear-mongering, of demonizing our neighbors, our loved ones, our communities and the cities that we love,” Pressley told reporters.

“I’m just proud of our mayor and her vigorous defense of our city, and that she is telling the accurate story of the vitality and the vibrance, and also that this is the safest big city in America,” Pressley added.

Wu referenced the city’s low homicide rate last year, the lowest on record for roughly 70 years, while defending the Hub’s public safety record amid blistering attacks from House Republicans. Democrats on the panel offered Wu and her colleagues support to counter the onslaught.

Boston’s mayor got in her own shots throughout the hearing, particularly when pushing back on border czar Tom Homan’s vow to bring “hell” to the Hub and urging Congress to do their “jobs” and fix the federal government’s broken immigration system.

“Let’s talk about Tom Homan,” Wu said. “Shame on him for lying about my city, for having the nerve to insult our police commissioner who has overseen the safest Boston in anyone’s lifetime. Bring him to Congress and let’s ask him some questions.”

Wu stumbled a bit, however, when she was the only mayor unable to provide any financial estimates as to what Boston has spent on illegal immigration in recent years, such as by housing migrants, providing asylum or through other protections.

While Chicago Mayor Brandon Johnson drew the ire of Republican lawmakers for limiting his estimate to expenses being roughly 1 percent of his city’s budget, after Denver and New York City mayors Mike Johnston and Eric Adams were able to provide concrete numbers at $79 million over the past two years and $6.9 billion, respectively, Wu was hammered for saying Boston doesn’t keep track.

Wu said she couldn’t provide a number because Boston doesn’t ask about immigration status, when asked several times to share the costs.

“You don’t ask how much money the city of Boston has spent on illegal immigration — are you out of your mind?” U.S. Rep. Byron Donalds, a Florida Republican, said. “Do you manage your budget?”

Wu responded by saying that she does, in fact, manage her budget, and that Boston has a healthy AAA bond rating.

MassGOP Chair Amy Carnevale later blasted Wu’s “lack of transparency” around taxpayer funds.

“Taxpayers deserve to know how much of their money is being diverted away from vital services from lifelong Bostonians to fund sanctuary city policies that encourage illegal immigration,” Carnevale said in a statement.

While Republicans largely bashed the three mayors of Boston, Chicago and Denver, Democrats defended their immigration protections and agreed with them they foster trust with local police that makes their communities safer.

Several directed their acrimony at Adams, the New York mayor facing federal corruption charges, while pressing him to reveal the circumstance behind the Trump administration’s push to drop the case.

The Justice Department ordered Manhattan federal prosecutors to drop their bribery case against Adams last month, saying in a memo that the indictment had interfered with the mayor’s ability to participate in Trump’s immigration enforcement, the Wall Street Journal reported.

“Are you selling out New Yorkers to save yourself from prosecution?” U.S. Rep. Robert Garcia, a California Democrat, asked.

Adams replied by saying,”There’s no deal, no quid pro quo, and I did nothing wrong.”