While Wu was giving her testimony, Mace held up a sign with a quote on it that said, " efforts actually threaten the safety of everyone."

Wu emerged from the marathon hearing largely unscathed, and managed to land a few hits in the face of aggressive questioning.

Boston Mayor Michelle Wu racked up a six-figure bill with a high-powered law firm in preparation for Wednesday’s intense congressional hearing on sanctuary cities in Washington, D.C.

The city of Boston is sick of having people outside Boston tell us what we need,” Mayor Wu said in a contentious hearing on local immigration policies in Boston and other cities.