NPR's Mary Louise Kelly talks with Boston mayor Michelle Wu, who just welcomed her third child. She's the first Boston mayor to give birth while in office.

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

Wu, who has said she will not take a formal maternity leave, gave birth to her daughter just over two weeks ago.

Mayor Michelle Wu will no doubt come up with some lame excuse for not testifying before Congress next month – maternity leave, racism, sexism, panic attack or some other equally bogus reason.

Mayor Michelle Wu is weighing how to respond to a call from congressional Republicans for her and other Democratic mayors to testify on Capitol Hill over their local immigration policies.

On Monday, the House Committee on Oversight and Government Reform opened a probe into so-called sanctuary cities for immigrants and has requested testimony from Boston Mayor Michelle Wu.

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.