Attorneys general in five Democratic-led states filed a lawsuit Thursday against the Trump administration after it said it would freeze money for several public benefit programs, citing concerns about fraud in the programs designed to help low-income families.

The states — California, Colorado, Minnesota, Illinois and New York — called the move an unconstitutional abuse of power. The Trump administration announced earlier this week it was withholding their social safety net funding. The funding went toward three federal programs, two of which focus on lifting families with children out of poverty.

New York Attorney General Letitia James, who is leading the lawsuit, said the Trump administration is overstepping its authority by freezing billions of dollars in funds that were already approved for the states by Congress.

The lawsuit filed in the U.S. District Court for the Southern District of New York asks the courts to order the administration to halt the freeze and release the funds.

“Once again, the most vulnerable families in our communities are bearing the brunt of this administration’s campaign of chaos and retribution,” James said.

The U.S. Department of Health and Human Services this week told the five states it was freezing their money for the Child Care and Development Fund, which subsidizes childcare for children from low-income families; the Temporary Assistance for Needy Families program, which provides cash assistance and job training; and the Social Services Block Grant.

HHS officials did not immediately respond to a request for comment on the lawsuit.

In an interview with CBS News Wednesday, Health and Human Services Secretary Robert F. Kennedy Jr. because they wouldn’t show the Trump administration plans for eliminating fraud. 

“The best way to help poor families is to end the fraud,” he told CBS News. Kennedy said the five states were impacted, not because they’re run by Democrats, but because they “refuse to cooperate with developing plans that would end the fraud.”

“We gave them a warning,” Kennedy said of the five states, claiming that the administration told them they wouldn’t cut funding if they presented a plan for handling fraud.

“But if you won’t show us a plan, a workable plan, we’re gonna cut it off until you do,” he said.

When asked how long the funding will be cut off, Kennedy replied, “That’s up to them.”

About half of the $10 billion in funding targeted by the Trump administration supported California programs, said the state’s attorney general, Rob Bonta.

In letters to the states, Alex J. Adams, assistant secretary for the Administration for Children and Families, wrote that HHS had “reason to believe” the states were providing benefits to people who were in the U.S. illegally, offering no further details about the allegations. They requested reams of data, including the names and Social Security numbers of everyone that had received some of the benefits.

“The letters requested that California turn over essentially every document ever associated with the state’s implementation of these federal programs and do so within 14 days, by Jan. 20, including personally identifiable information about program participants,” Bonta said. “That is deeply concerning and also deeply frustrating.”

The government intensified its focus on the childcare subsidy program after a conservative YouTuber released a video claiming day care centers in Minneapolis had committed up to $100 million in fraud. The childcare centers were run by members of the city’s Somali community, which has been frequently maligned by President Trump and targeted by immigration authorities.

Minnesota Gov. Tim Walz, a Democrat, has defended his state’s response and said his state is taking aggressive action to prevent further fraud.