Mayor Eric Adams’ battle with the City Council seems to be growing.

On Tuesday, the City Council threatened litigation against the Adams administration if it doesn’t comply with implementing the expansion of a rental assistance voucher known as CityFHEPS, which helps homeless New Yorkers find a home.

Last May, the City Council approved the move, in an effort to get more people into permanent homes and clear beds for arriving migrants.

The laws took effect Tuesday, but City Hall refuses to fund the changes.

“We changed the eligibility rule to allow folks in the process of getting evicted or who would otherwise qualify be able to access a voucher,” said City Councilmember Diana Ayala. “It takes two parties to negotiate and at this point there has been no attempt to transition or implement this new law.”

On Tuesday, Council Speaker Adrienne Adams fired off a letter to the administration, giving them until Feb. 7 to comply or face legal action.

“Everyday [Department of Social Services] delays in implementing the laws is a day that more New Yorkers needlessly end up or remain in homeless shelters, and the City faces unnecessary legal liability. We look forward to your prompt action,” read the letter from Speaker Adams to Commissioner Molly Park.

Ayala sponsored the legislation that expanded CityFHEPS and initially sent a letter to the Department of Social Services in November asking about implementation plans.

In December, Commissioner Molly Park wrote back saying due to financial, operational and legal issues, “these local laws cannot be implemented at this time.”

“This is a dereliction of duty. The city council has a responsibility to enact laws. And the mayor and his administration have a responsibility to follow and put those into practice,” said Ayala.

City Hall maintains the expansion is too costly and increases competition for housing units.

“This legislation and its $17 billion price tag will make it harder for New Yorkers in shelter to move into permanent housing at a time when there are 10,000 households in shelter that are eligible for CityFHEPS and force more painful budget cuts onto working-class New Yorkers,” said Deputy Press Secretary Kayla Mamelak in a statement on Tuesday.

Mamelak also pointed to the mayor’s elimination of the 90-day rule that required New Yorkers to spend three months in shelter before qualifying for a city housing voucher and a new policy that allows vouchers to be used across New York state.

Separately, The Legal Aid Society, which represents clients facing eviction, threatened to also take legal action, arguing that dozens of New Yorkers could soon be living in the street.

“We are always going to act in the interests of our clients and if there are benefits that we consider available to them that are not being extended to them then we will take action,” said Robert Besir, a staff attorney at The Legal Aid Society’s Civil Law Reform Unit.

The threat of litigation comes just a week before Mayor Adams is set to unveil his executive budget that outlines his legislative priorities for the coming fiscal year.

Meanwhile, the city is facing a fiscal cliff amid the growing costs to house and feed asylum seekers, and another round of budget cuts is expected by the end of January.