Some Republicans in the U.S. House are warning that Boston Mayor Michelle Wu could be charged criminally over the city's sanctuary policies. 

House Republicans accused Wu and the mayors of other big cities with sanctuary policies of breaking the law. 

Florida Congresswoman Anna Paulina Luna says the Boston Trust Act restricting police from helping immigration authorities is a violation of federal law. 

The members indicate that they might seek to have criminal charges filed against the mayors, or refer the matter for a U.S. Department of Justice investigation.