Immigrants and advocates asked Boston City Councilors on Monday to preserve and strengthen the Trust Act, the law that limits police coordination with federal immigration authorities except for on criminal investigations.

Boston city councilors stood fast in their support of the city’s pro-immigrant Trust Act at a hearing Monday, defying President Donald Trump’s threats to crack down on so-called “sanctuary cities.”

Donald Trump’s border czar has turned his anger over illegal immigration to Boston. He denigrated the police commissioner and suggested that the so-called sanctuary city is holding onto hardened criminals,