The Justice Department on Thursday sent out a “last chance” warning for several U.S. cities to comply with federal immigration laws, the latest step in a battle over so-called “sanctuary cities.”

The Justice Department has threatened to cut off federal funding to boost law enforcement in cities that do not comply with the Department of Homeland Security’s efforts to identify and deport undocumented immigrants.

The cities cited by the Justice Department were New York, Chicago and surrounding Cook County, Ill., New Orleans and Philadelphia. Those cities were given a deadline of Oct. 27 to provide the Justice Department with documentation proving their existing laws and law enforcement practices are in line with federal immigration policy.

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