Michelle Wu called on her top challenger Josh Kraft to release his tax returns to reveal any financial interests or business “entanglements” he may have with the city that could impede his ability

Robert Kraft’s son, Josh Kraft, has left the Patriots franchise as he zeroes in on the Boston mayoral race, where early polling shows he’s trailing substantially to incumbent Michelle Wu. Josh, 58, is trailing Wu in the polls, 59-29 percent, ahead of this November’s election cycle. They are running as Democrats.

With the city’s preliminary election closing in, Boston Mayor Michelle Wu holds a nearly 30-point lead over her nearest challenger, according to a new poll. Wu leads philanthropist and community activist Josh Kraft 59%-29% in the new Boston Globe/Suffolk University poll out Monday.