Former Rep. Barney Frank, a liberal icon who was a key architect of the landmark Wall Street regulations Democrats enacted in the wake of the 2008 financial crisis, has entered hospice care at his home in Maine. And as one of his last acts, he is preparing to release a book repudiating his party’s left flank.

A champion of liberal causes during his 32 years representing Massachusetts in the House, Frank says progressive Democrats have “embraced an agenda that goes beyond what’s politically acceptable.”

“Until we separate ourselves from that agenda, we don’t win,” he said in an interview Tuesday.

Frank, who served in the House from 1981 to 2013, said he feels “very good — no pain, no discomfort,” but has entered hospice care as he deals with congestive heart failure. He is remaining in his home in Ogunquit, Maine, where he moved with his husband after retiring from Congress.

“At 86, I’ve made it longer than I thought,” Frank said. “At some point, my heart’s just going to give out, and it’s reaching that stage. So I’m taking it easy at home and dealing with it by relaxing.”