Mayor de Blasio’s pals in the Working Families Party on Monday demanded that Hillary Clinton agree to debate Bernie Sanders about New York issues before the state’s April 19 primary.

Brooklyn native Sanders said he’s looking to upset the former New York senator on what is considered her own turf.

While de Blasio backs Clinton the WFP supports Sen. Sanders of Vermont.

De Blasio said that he’s a “fan” of debates but added, “It’s up to the candidates to decide.”

The WFP sent an e-mail blast to thousands of supporters touting Sanders’ caucus victories over the weekend in Washington state, Alaska and Hawaii.

“With a massive 291 delegates up for grabs, New York is shaping up to be the most pivotal moment in this entire campaign . . . Ask Hillary Clinton to debate Bernie Sanders in New York!” the WFP said.

Sanders can “absolutely” win New York, said the campaign’s state counsel, Arthur Schwartz.

The Clinton campaign has held about 20 organizing events throughout New York to re-activate her network of supporters from her Senate campaign days.

Additional reporting by Yoav Gonen