New York City Mayor Bill de Blasio (D) and 11 other U.S. mayors issued a stark warning to the Trump administration on Friday, saying public housing cuts would lead to a crisis involving the health of residents and crumbling infrastructure.

The letter, which was reported by The Washington Post, pressed the administration to reconsider the $1.3 million cut to the public housing capital fund, which is put toward plumbing, electric systems and roofs in the 1.2 million public housing units across the country.

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“We are on the precipice of a public health crisis in public housing, however, this is a preventable crisis,” the letter addressed to Housing and Urban Development (HUD) Secretary Ben Carson said.

The letter also said aging infrastructure has led to increased health problems for residents who receive assistance, such as elevated lead levels in blood, as well as asthma and respiratory illness.

The Trump administration’s proposed budget that was released in May showed a $6 billion loss in HUD funding, saying states, local governments and housing authorities should take up responsibilities that used to fall under HUD.

Office of Management and Budget Director Mick Mulvaney said there is no clear-cut evidence that the federal programs have actually helped the lives of individuals receiving those benefits.

However, mayors claimed in the letter that local governments could not take on the financial responsibility if they did not have the capital fund.

The letter is another sign of a deepening divide between the Trump administration and various U.S. mayors. Mayors across the U.S. have also pushed back against the White House on policies including climate change and immigrations.

HUD spokesperson Brian Sullivan told The Hill the department would not comment on the letter until it issued a response.