Boston Mayor Michelle Wu has been asked to testify at a Congressional hearing as part of a federal investigation into sanctuary cities.

Boston Mayor Michelle Wu said Tuesday that the city is still determining how to respond to a call from congressional Republicans for her and other Democratic mayors to appear at a Capitol Hill hearing to discuss their local immigration policies.

Republican Rep. James Comer of Kentucky has asked Wu to appear before a House committee next month, as it investigates 'sanctuary' communities and whether they are preventing federal immigration agents from removing dangerous criminals.