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.

House Republicans called for Wu and three other mayors to appear before Congress next month to testify about their "sanctuary jurisdictions."

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.

In a statement, a city spokesperson said, “We are proud that Boston is the safest major city in the United States. We have received the letter and are reviewing it.”

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

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 said Tuesday that the city is still determining how to respond to a call from congressional Republicans for her and other Democratic mayors to face questions on Capitol Hill about their local immigration policies.

Boston Mayor Michelle Wu said Tuesday that Republicans in Washington D.C. are "playing politics" with immigration and suggested they are purposely trying to create a sense of fear.