For years, federal immigration authorities have waged wars of words with Boston and other so-called sanctuary cities that limit cooperation with federal immigration officials.

San Francisco's city attorney announced Friday the city is suing the Trump administration after the president signed an executive order to withhold federal aid to cities that don't comply with his immigration policies.

San Francisco, joined by a coalition of jurisdictions, is filing a lawsuit against the Trump administration over its threats to punish sanctuary cities that do not assist in immigration enforcement.