Washington (CNN) Chicago Mayor Lori Lightfoot announced Friday that the Chicago Police Department will not cooperate with Immigration and Customs Enforcement raids that are expected in Chicago and nine other major cities starting Sunday.

"I have directed -- and Superintendent Johnson has confirmed -- that CPD has terminated ICE's access to CPD's databases related to federal immigration enforcement activities," Lightfoot said in a statement, and reiterated the city's support for immigrant communities.

"I have also personally spoken with ICE leadership in Chicago and voiced my strong objection to any such raids. Further, I reiterated that CPD will not cooperate with or facilitate any ICE enforcement actions," Lightfoot continues.

After President Donald Trump tweeted on Monday that an operation to deport "millions" of undocumented immigrants was imminent, a senior immigration official told CNN that ICE was moving forward with a raid that is expected to target families with court-ordered removals -- approximately 2,000 people in 10 cities.

Agents at local field offices are receiving briefings and trainings, according to the senior immigration official. Preparations also are being made for mixed-immigration-status families: for example, if a parent is undocumented but has a US citizen child.

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