The Boston mayor is “evaluating” a letter she received Monday from U.S. Rep. James Comer, asking her to testify in a federal hearing investigating her noncompliance with federal immigration policy.

Mayor Michelle Wu, facing the possibility of Boston losing millions in federal dollars, on Tuesday spoke after being asked to testify at a sanctuary cities hearing on Capitol Hill.

Boston Mayor Michelle Wu brought her newborn daughter to work at City Hall on Tuesday. Mira Wu Pewarski was born on Jan. 13 at 2 p.m., weighing 8 pounds, 4 ounces and measuring 20 inches. She is the third child of the mayor and her husband, Conor.