With less than two months remaining in office, Mayor Eric Adams of New York landed in Israel over the weekend to meet with business and political leaders and discuss rising global antisemitism. Unspoken but implicit in his agenda was a desire to draw a clear contrast between his relationship with the Jewish community and that of Zohran Mamdani, a critic of Israel who will become New York’s first Muslim mayor when he is sworn in on Jan. 1. At a reception in his honor hosted by the Combat Antisemitism Movement in Tel Aviv on Sunday, Mr. Adams took a question...