Under normal market conditions, the fund invests at least 80% of its net assets, plus amounts borrowed for investment purposes, in municipal bonds of any maturity. It primarily invests in bonds that are investment grade when purchased, but the fund may also invest up to 20% of its net assets in non-investment grade bonds rated BB or lower by S&P Global Ratings, Fitch Ratings, or Moody’s Investors Service, Inc., or comparable rating by any NRSRO or unrated equivalents.