Wu was one of 32 mayors and governors across the country to receive a letter from the U.S. Department of Justice

Mayor Michelle Wu responded Tuesday to an ultimatum from the federal government over sanctuary city policies, saying Boston "will not back down."The U.S. Department of Justice sent letters to several so-called "sanctuary" jurisdictions on August 13,

In a letter responding to Bondi's threats to withhold federal funding from alleged "sanctuary" locations, Wu said Boston law enforcement routinely cooperates with federal authorities on criminal matters.