Brooklyn Sen. Simcha Felder just made things a bit more complicated in the state Senate.

Felder, a Brooklyn Democrat who has aligned himself with the Senate Republicans since he was first elected in 2012, sent a letter to the leader of the eight-member Independent Democratic Conference on Wednesday urging them to “unconditionally” join with the mainline group of Democrats in the state Senate.

The letter was first reported by The New York Times and obtained by Spectrum News by a source.

The development comes a day after Democrat Brian Benjamin won a Harlem-area Senate seat in a special election, pushing the number of enrolled Democrats to 32 lawmakers.

Updated: In a statement, IDC spokeswoman Candice Giove noted Felder is not tipping his hand on where he stands on the issues a coalition of liberals would like to see approved if the Democrats gain the majority.

“It’s telling that Simcha Felder didn’t sign the pledge,” she said. “We now see where he stands on these seven crucial issues.”

In a separate letter, Senate Minority Leader Andrea Stewart-Cousins pointed to Benjamin’s election on Tuesday, urging Klein to rejoin the conference.

“We need you to join with the Senate Democratic Conference to ensure that our conferences control the New York State Senate,” she wrote in the letter. “Only by signing this pledge will we succeed in accomplishing many of your stated goals.”

Democrats, however, are denied an outright majority because of the fractured nature of the chamber. Felder has provided a key 32nd member for the Senate Republicans in the 63-member state Senate.

A variety of pressure groups have urged the IDC, first formed in 2011, to join with Democrats in the Senate and essentially end Republican rule — a push that has been made all the more urgent for liberals following Donald Trump’s election to the presidency.

“With 32 Democrats again in the Senate Chamber, we have the opportunity to pass progressive legislation to resist Donald Trump and serve as a beacon to a weary nation,” Stewart-Cousins wrote in the letter.

The Senate is the last lever of power the GOP holds statewide in New York.

But Klein has sought to point out with the release of a video this week that even with 32 Democrats, votes would not necessarily be available for enacting key pieces of the liberal agenda, such as strengthening abortion rights.

Felder has over the years worked well with Senate Republicans, who have empowered him with plumb committee post overseeing education issues for New York City.

Adding more fuel to the fire that has ignited in the Senate in recent weeks has been a controversy over paid stipends to lawmakers, including three IDC members, who hold the title of vice chair, but receive money usually designated for a committee chairman.

Democrats have called for an investigation into the arrangement, and federal, state and Albany County prosecutors have looked into the issue.

Simcha by Nick Reisman on Scribd

ASC Letters by Nick Reisman on Scribd