The chief of police in Washington, D.C., will allow the Metropolitan Police Department to work with federal immigration authorities to arrest illegal immigrants, an unprecedented move that follows President Donald Trump’s crackdown on crime in the city.

The immigration agency must hold fewer detainees and provide them with medical care and regular access to lawyers, Judge Lewis A. Kaplan said.

A federal judge ordered the Trump administration Tuesday to immediately improve conditions at a New York City immigration holding facility, acting on complaints by jailed migrants that it is dirty, smelly and overcrowded.