WASHINGTON: Donald Trump´s administration on Thursday sued so-called “sanctuary” city Chicago and the state of Illinois for, it argued, blocking the US president´s efforts to deport undocumented migrants.

The lawsuit seeks to overturn measures passed in recent years that prohibit police from arresting people based on their immigration status and limit what information can be shared with federal authorities.

Thursday´s filing cites Trump´s declaration of a “national emergency” on the southern US border and an executive order he signed stating that many illegal migrants present “significant threats to national security and public safety.”