The New York State United Teachers union is among the “forces of evil” spending heavily to elect Democrats to the state Senate and oust Republicans from their last lever of statewide power, Senate Majority Leader John Flanagan on Monday said in a radio interview.

“You have incumbents that are in tough races and we have what I describe outside forces and some of them have almost become like the forces of evil spending millions and millions of dollars,” Flanagan said in an interview on WCNY’s The Capitol Pressroom.

Asked who the “forces of evil” are, Flanagan singled out the umbrella labor group that has been at odds with Senate Republicans for much of the year.

“I believe that NYSUT has demonstrated they want one-party rule,” he said. “They don’t like the way things are going. They spent over $5 million in the last cycle.”

Flanagan insisted that Republicans in the Senate back the “tens of thousands” of teachers in the state and want to support them in the classroom.

“We have worked diligently with them and we continue to do so, but they gratuitously go after our members,” Flanagan said of the union. “They just don’t want to have the Republicans there because we don’t go blithely along with everything they want.”

It was not that long ago that NYSUT could be counted as quiet allies of the Senate Republicans. Flanagan himself is a former Education Committee chairman.

NYSUT this year had pushed for a bill that would decouple state examinations from teacher evaluations, but the measure stalled in the state Senate.

NYSUT, along with the Communications Workers of America and 32BJ have spent heavily against Republican candidates in key elections on Long Island and in the Hudson Valley as well as a central New York race. Republicans hold a narrow, one-seat majority in the chamber.

The state Republican Committee plans to file a complaint against the effort, alleging illegal coordination, according to The Daily News.

“Sen. Flanagan must be getting desperate if he’s saying that more than 600,000 educators are forces for evil,” said NYSUT President Andy Pallotta. “He had a chance to stand with teachers by reforming the state’s broken testing and evaluation system but instead he chose to cozy up to Wall Street billionaires and the charter industry.”