As Mayor Michelle Wu prepares to go to Congress to defend Boston's protections of immigrant communities, the city is in a war of words with the Trump administration and Republican representatives over how much police should support deportations.

President Donald Trump's border czar Tom Homan teed off against Boston's police commissioner in a speech to the Conservative Political Action Conference, saying there are at least nine accused “child rapists” in jail who local authorities won't turn over to U.

The attack comes as Wu prepared to defend the city's approach to immigration enforcement before Congress next week.