With Josh Kraft officially kicking off his campaign to challenge incumbent Mayor Michelle Wu, battle lines are beginning to take shape in Boston's mayoral race.

Mayor Wu is both gearing up for a competitive race against Kraft and preparing to testify before Congress about Boston's "sanctuary" policies.

Out Wu’ing Boston Mayor Michelle Wu. As he launched his campaign for the city’s top spot on Tuesday, the scion of one of the state’s wealthiest and most well-known families more or less promised to do all the stuff Wu promised to do during her first term.