The Democratic-led Assembly’s hesitance to approve a permanent extension is potentially due to their “carrying the agenda” of the teachers union, Gov. Andrew Cuomo said in a radio interview Tuesday morning that Assembly Speaker Carl Heastie blasted as inappropriate and unfair.

Cuomo this year wants a permanent extension of the state’s cap on property tax increases, a measure that expires in 2020 and was first approved in 2011.

The Democratic-led Senate approved an extension in February; the Assembly is yet to take it up.

“My guess, if I had to guess, the, they are protecting or carrying the agenda for people who are against the tax cap,” Cuomo said on WAMC’s The Roundtable. “”Who’s against the tax cap? Primarily in New York City, the teacher’s union. And I said look, if you want to do something about education cost, why don’t you cap the superintendent’s salary? Why are we paying, doctor, $300,000 for a school superintendent?”

Heastie bristled at his motives being questioned by Cuomo.

“I think it’s really inflammatory to make those statements about peoples’ motives,” he said. “I never do that about him and what goes around him. I think it’s wholly unacceptable to question the Assembly’s motives.”

He added, “Why he’s doing that, I have no idea.”

The budget season so far has led to an extended war of words between Cuomo and lawmakers. Earlier on Tuesday, Senate Majority Leader Andrea Stewart-Cousins accused Cuomo of having “Senate Democratic derangement syndrome” in his criticism of the conference.