Two members of the US Congress on Wednesday slammed New York City Democratic mayoral nominee Zohran Mamdani after he pledged to abandon a widely used definition of antisemitism if elected.

Reps. Mike Lawler, a Republican from New York, and Josh Gottheimer, a Democrat from New Jersey, said in a joint statement that Mamdani’s plan to scrap the International Holocaust Remembrance Alliance (IHRA) working definition of antisemitism is “dangerous” and “shameful.” The IHRA definition — adopted by dozens of US states, dozens of countries, and hundreds of governing institutions, including the European Union and United Nations — has been a cornerstone of global efforts to monitor and combat antisemitic hate.

“Walking away from IHRA is not just reckless — it undermines the fight against antisemitism at a time when hate crimes are spiking,” Lawler said in his own statement. Gottheimer echoed that concern, arguing that dismantling the definition “sends exactly the wrong message to Jewish communities who feel under siege.”

The backlash followed Mamdani’s comments last week to Bloomberg News in which he vowed, if elected, to reverse New York City Mayor Eric Adams’ executive order in June adopting the IHRA standard. Mamdani, a democratic socialist and state assemblymember, argued that the IHRA definition blurs the line between antisemitism and political criticism of Israel and risks chilling free speech.

“I am someone who has supported and support BDS [the boycott, divestment, and sanctions movement against Israel] and nonviolent approaches to address Israeli state violence,” he said at the time.

The BDS movement seeks to isolate Israel from the international community as a step toward its eventual elimination. Leaders of the movement have repeatedly stated their goal is to destroy the world’s only Jewish state.

“Let’s be extremely clear: the BDS movement is antisemitic. Efforts to delegitimize Israel’s right to exist are antisemitic. And refusing to outright condemn the violent call to ‘globalize the intifada’ — offering only that you’d discourage its use — is indefensible,” Lawler and Gottheimer said in their joint statement, referring to Mamdani’s recent partial backtracking after his initial defense of the use of the phrase “globalize the intifada.”

“There are no two sides about the meaning of this slogan — it is hate speech, plain and simple,” the lawmakers continued. “Given the sharp spike in antisemitic violence, families across the Tri-State area should be alarmed. Leaders cannot equivocate when it comes to standing against antisemitism and the incitement of violence against Jews.”

IHRA — an intergovernmental organization comprising dozens of countries including the US and Israel — adopted the “working definition” of antisemitism in 2016. Since then, the definition has been widely accepted by Jewish groups and lawmakers across the political spectrum.

According to the definition, antisemitism “is a certain perception of Jews, which may be expressed as hatred toward Jews. Rhetorical and physical manifestations of antisemitism are directed toward Jewish or non-Jewish individuals and/or their property, toward Jewish community institutions and religious facilities.” It provides 11 specific, contemporary examples of antisemitism in public life, the media, schools, the workplace, and in the religious sphere. Beyond classic antisemitic behavior associated with the likes of the medieval period and Nazi Germany, the examples include denial of the Holocaust and newer forms of antisemitism targeting Israel such as demonizing the Jewish state, denying its right to exist, and holding it to standards not expected of any other democratic state.

In a statement, the Mamdani campaign confirmed that the candidate would not use the IHRA definition of antisemitism, which major civil rights groups have said is essential for fighting an epidemic of anti-Jewish hatred sweeping across the US.

“A Mamdani administration will approach antisemitism in line with the Biden administration’s National Strategy to Counter Antisemitism — a strategy that emphasizes education, community engagement, and accountability to reverse the normalization of antisemitism and promote open dialogue,” Mamdani spokesperson Dora Pekec told the New York Post.

Lawler and Gottheimer’s pushback comes as Congress debates the Antisemitism Awareness Act, legislation that would codify IHRA’s definition into federal law. Advocacy groups such as the Anti-Defamation League (ADL) have urged lawmakers to back the measure, warning that antisemitic incidents have surged nationwide over the past two years and having a clear definition will better enable law enforcement and others to combat it.

For Mamdani, the controversy over the IHRA definition adds a new flashpoint to a mayoral campaign already drawing national attention. 

A little-known politician before this year’s Democratic primary campaign, Mamdani is an outspoken supporter of the BDS movement. He has also repeatedly refused to recognize Israel’s right to exist as a Jewish state, falsely suggesting the country does not offer “equal rights” for all its citizens, and promised to arrest Israeli Prime Minister Benjamin Netanyahu if he visits New York.

Mamdani especially came under fire during the summer when he initially defended the phrase “globalize the intifada”— which references previous periods of sustained Palestinian terrorism against Jews and Israels and has been widely interpreted as a call to expand political violence — by invoking the Warsaw Ghetto Uprising during World War II. However, Mamdani has since backpedaled on his support for the phrase, saying that he would discourage his supporters from using the slogan.