A GOP-led committee questioned mayors Wednesday on their limited cooperation with federal immigration authorities. Boston's Mayor Wu has argued the policy keeps the city safe and builds trust with diverse communities.

Mayors from Boston, Chicago, Denver and New York are set to testify in Congress as Republicans take aim at “sanctuary cities” policies

Mayor Michelle Wu touted Boston as the “safest major city” in the country and took a swipe at the federal administration for spreading fear and undermining police work in her opening remarks