Boston Mayor Michelle Wu is expected to take a crucial step to securing a second term when voters go to the polls.

Tuesday's special election will narrow the field to the top two candidates.

The expectation is that Wu will face Josh Kraft in November.

Wu is the city’s first Asian and female leader. Kraft is a nonprofit leader who is also the son of Patriots owner Robert Kraft.

For months, Wu has maintained a double-digit lead over Kraft, despite him spending millions of dollars of his own money on his campaign.

Wu has been bolstered in part by her defense of the city against attacks from the Trump administration.

Both are Democrats, and the party has occupied City Hall for the past century, though the position is nonpartisan.

AP Video shot by Rodrique Ngowi.