The mayor listened intently as the rabbis conveyed to him their concerns about the rise of antisemitism in New York City, and in many cases, their belief that the mayor’s political rhetoric has contributed to the atmosphere of hostility. The press was kept out of Mamdani’s roundtable with the rabbis. It was a closed-door session — no transcripts, images or videos released by City Hall. In many ways, it was an extraordinary circumstance from a mayor who has made social media such a central part of his administration, as it was in his campaign. But in speaking with some of...