Boston Mayor Michelle Wu may be facing criminal prosecution for the city’s sanctuary policies after the prospect of federal charges was raised by numerous Republican lawmakers who grilled her at a

Democratic mayors of four major cities testified before the House Oversight Committee over their cities' policies limiting cooperation with immigration enforcement under the Trump administration.

Immigration law, the mayors said, is a federal responsibility, and the attempt to put that responsibility on local law enforcement makes communities distrust the police and others they may need to call for help. Trump’s crackdown, the mayors said, has terrified immigrants, many of them in the U.S. legally.