Chicago, one of the “sanctuary cities”  that limit their co-operation with US federal immigration enforcement. Photograph: Saul Loeb/AFP/Getty Images

A judge in San Francisco on Tuesday temporarily blocked US president Donald Trump’s efforts to starve localities of federal funds when they limit thei(...)

Maya Casillas (7) takes part in a  protest outside  City Hall in Los Angeles against US president Donald Trump’s crackdown on “sanctuary cities”,  which generally do not comply with federal requests to detain unauthorised immigrants who have been arrested on charges unrelated to their immigration status. Photograph: Mark Ralston/AFP/Getty Images

The mayors of US cities large and small reacted with outrage after president Donald Trump signed an executive order on Wednesday saying he would halt (...)