BOSTON — The head of the Massachusetts Senate says he remains committed to greater scrutiny despite long delays on a promised review that many hoped would expand the state’s public records law.

Democratic state Senate President Stan Rosenberg says lawmakers are painfully aware that Massachusetts is the only state in the U.S. where the Legislature, governor’s office and judiciary are exempt.

Rosenberg told Thursday’s annual meeting of the Massachusetts Newspaper Publishers Association he hopes a bill expanding the law to all three branches of government will be introduced early in 2018.

A bill signed by Republican Gov. Charlie Baker required lawmakers to study the issue and produce a report by year’s end. But that review commission has yet to meet.

Rosenberg’s message to those disappointed by the inaction: “Mea culpa.”