Boston Mayor Michelle Wu is kicking off her campaign for re-election with a strong lead over her opponent Josh Kraft, according to an Emerson College poll released Thursday.

The endorsement is the first time in more than 30 years that the city's largest police union has supported a Boston mayor for reelection, the union said.

Michelle Wu holds a double-digit lead over philanthropist Josh Kraft in the race for Boston mayor, a new poll from Emerson College finds. The preliminary election to narrow the field down to two candidates is in September. The poll asked more than 600 registered voters who they would vote for if the election were held today.

Boston Mayor Michelle Wu will find herself testifying before a Congressional committee Wednesday with a hostile Republican majority intent on grilling her and three other Democratic mayors on their limited cooperation with federal immigration enforcement.

The survey offers the first early look at the matchup between the first-term progressive mayor and her most prominent challenger.

City faith leaders told Mayor Michelle Wu there’s a lot of “fear” in the community, at a time when President Trump’s border czar is vowing to bring “hell” to Boston and Wu is prepping for a Congressional grilling over the Hub’s sanctuary policies.

Boston’s largest police officers' union will endorse incumbent Mayor Michelle Wu for reelection on Thursday afternoon, its leadership said. The Boston Police Patrolmen’s Association said its members voted “overwhelmingly” to support Wu at the union’s most recent monthly meeting.