Israeli Prime Minister Benjamin Netanyahu on Tuesday slammed New York Mayor Zohran Mamdani’s positioning on Jews, warning he will target the mayor’s stance during his upcoming speech at the United Nations General Assembly.

Netanyahu is traveling to New York City to give an address to the U.N. on Thursday, as his country becomes increasingly isolated from the world. The prime minister previewed his speech in a message to social media, revealing he will “tell the truth” about Mamdani and framing him as someone sympathetic to Hamas, the terrorist group that controls Gaza and carried out the Oct. 7, 2023, attack on Israel.