Boston is one of four cities under scrutiny by a House panel's investigation into so-called sanctuary cities. Why it matters: The probe is Mayor Michelle Wu's biggest test yet as to whether the city's commitment to protect immigrants,

The city has been singled out as one of the nation’s four most problematic sanctuary cities and Mayor Michelle Wu has been asked to testify about its “sanctuary policies” at a public hearing next month,

Boston Mayor Michelle Wu was one of four mayors called before the House's Committee on Oversight and Government Reform to testify on their status as sanctuary cities.