Josh Kraft, the longtime nonprofit leader and younger son of billionaire New England Patriots owner Robert Kraft, has filed paperwork with state campaign finance regulators to run for mayor of Boston as a Democrat.

The philanthropist and son of billionaire Patriots owner Robert Kraft is preparing to challenge Boston Mayor Michelle Wu.

Josh Kraft, son of the Patriots owner, opened an account with the Office of Campaign and Political Finance to be able to raise funds for what could be a challenge to Mayor Michelle Wu.