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.

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.

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.

Boston Mayor Michelle Wu says her administration feels “very strongly that we’re on solid legal ground” in being a sanctuary city and is still reviewing a letter it received from Congress on getting called to testify on such policies.