As Boston Mayor Michelle Wu departed Capitol Hill on Wednesday, her challenger in this year’s mayoral race, Josh Kraft, said he supported the immigration policy that Wu had defended to congressional Republicans.

The Congressional hearing was part of a federal investigation into so-called "sanctuary cities."Committee Chairman James Comer, a Republican from Kentucky, launched the probe back in January to look into what he described as "the policies of sanctuary jurisdictions and their impact on public safety and federal immigration enforcement.

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