From the Morning Memo:

Gov. Andrew Cuomo is backing a push by the state Democratic Committee to find a primary opponent against Sen. Simcha Felder, the Brooklyn Democrat who conferences with Republicans in the state Senate and is a pivotal member of the GOP’s retained majority in the chamber.

A source with direct knowledge involved in the effort said Monday evening that state Democrats are trying to find and identify the “best possible candidate” to run in the Senate district. That candidate could still be Felder’s declared primary opponent, Blake Morris, but Democrats are open to finding other candidates who could competitively run in the district.

Regardless, the source vowed that if Felder does not conference with Democrats in the Senate, he’ll face a primary with “the full weight of the party” behind it.

Felder, through a spokeswoman, declined to comment.

Senate Democrats on Monday sworn in two new lawmakers: Sens. Shelley Mayer and Luis Sepulveda, seats the party retained in last week’s special elections in the Bronx and Westchester County. The party now has a mathematical majority in the chamber.

As voting was underway last week, Felder declared he would remain with Republicans in the Senate at least through the end of the legislative session in June, giving the GOP the needed 32nd member in the 63-seat Senate.

Cuomo last week publicly urged Felder to reconsider the decision to stay with Republicans, saying “these are not usual days” but declined to say what pressure he would apply to the lawmaker to make the switch.

Cuomo in recent weeks has stepped up public efforts on behalf of Democrats running for the state Senate. He publicly campaigned for Meyer and Sepulveda in April and last week appeared at a rally for Democrat Anna Kaplan, who is running in a swing district on Long Island.