U.S. President Donald Trump signed an executive order Monday targeting "sanctuary cities" that have declined to co-operate with federal efforts to arrest undocumented immigrants.

The order calls for the attorney general and secretary of homeland security to publish a list of cities and states failing to comply with federal immigration laws, warning those that don't comply could lose federal funding.

Trump has criticized cities and states that limit co-operation with federal immigration enforcement, labelling them "sanctuaries" and blaming them for releasing criminal offenders instead of co-ordinating their transfer to Immigration and Customs Enforcement (ICE).

Last week, a federal judge blocked Trump's administration from withholding federal funding from more than a dozen so-called sanc

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