The New York State Republican Party is launching an ad campaign urging Jewish voters to join the GOP — while accusing Democrats including Mayor Zohran Mamdani of promoting or condoning antisemitism.

The ad — appearing in Jewish publications and Jewish-concentrated social media — contains an open letter from State GOP Chairman Ed Cox addressed “To Our Jewish Neighbors and Fellow New Yorkers.”

“The New York State Republican Party stands with you. Unequivocally,” Cox wrote in the letter.

“We consider Israel a democratic miracle, America’s indispensable ally, and proof that the Jewish people’s ancient covenant with their land was not a relic of history but a promise to be fulfilled,” the letter said.

“We stand against antisemitism wherever it appears, because we understand what Judaism has given the world. Jewish scripture is central to the moral architecture of Western civilization.”

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Cox then unloads on Mamdani and other Democratic leaders for condoning, if not fanning the flames of, antisemitism.

“We watch with sadness as the Democratic Party, which alleges to stand for marginalized groups, spirals into that ugliest and oldest hatred, anti-Semitism,” he wrote.

“Zohran Mamdani’s statement calling AIPAC and its members ‘monsters’ has no place in American political discourse,” Cox said, referring to Mamdani’s comments about the American Israel Public Affairs Committee.

“It is the worst kind of antisemitism.”

Cox ripped Gov. Kathy Hochul and House Democratic Minority Leader Hakeem Jeffries for endorsing Mamdani’s campaign for mayor and Senate Democratic Minority Leader Chuck Schumer, who is Jewish, claiming he “cowers in silence.”

“We stand with our fellow patriotic Americans at AIPAC, as they work to strengthen the American-Israeli relationship and fight the scourge of antisemitism that has found a home in the Democratic Party and is championed by New York City’s mayor,” Cox said in the letter.

He claimed Jews were leaving the Democratic Party “in droves.”

“From Maine to Michigan to New Jersey to right here in New York, you are told you are no longer welcome. Please know that, unlike the Democratic Party, the New York State Republican Party values you and would be proud to have you among our ranks. You have a home with us,” Cox said.

Mamdani and his allies in the Democratic Socialists of America are staunch critics of Israel. 

The mayor even supports the boycott, sanctions and divestment campaign against the Jewish state, which the Anti-Defamation League describes as a form of antisemitism.

The three Mamdani-backed House candidates who won Democratic primary elections last month — Darializa Avila Chevalier, Claire Valdez and Brad Lander, who is Jewish — are Israel bashers who accuse the Jewish state of genocide in Gaza.

Mamdani and other critics maintain they’re pro-Palestinian critics of Israel, but that they oppose antisemitism.

The mayor does not support Israel existing as a Jewish state.