Boston Mayor Michelle Wu testified before a House committee on so-called "sanctuary cities" in Washington Wednesday.

Boston Mayor Michelle Wu firmly defended the city’s immigration and law enforcement policies at a six-hour-long congressional hearing in Washington March 5, where she faced questions from Republican lawmakers on Boston’s immigrant population and cooperation with federal immigration officers.

The much-hyped hearing, Wu’s first time on the national stage, turned out not to be so much of a show but more of a legal grilling of the mayor and three other city mayors aimed at getting them to