Many Muslim Americans in New York City were impressed by Mr. Mamdani’s campaign and thrilled at being able to see themselves reflected in a mayoral candidate.

In a post-election interview, Zohran Mamdani, the likely winner of the Democratic primary for mayor of New York, said he took some lessons from Donald Trump’s focus on the cost of living.

Not since 2019 have so many New Yorkers in a single day sought emergency medical attention for heat-related illnesses.

Images of a smiling President Trump popped up on some screens, although they could not be conclusively linked to the episode.