Former US President Barack Obama and New York City mayor Zohran Mamdani met for the first time on Saturday at a child care centre in the Bronx where they sang to preschoolers.

Obama and Mamdani led the group in singing Wheels on the Bus and the children taught them Soda Pop from K-pop film Demon Hunters.

“You made the mayor feel really old,” Obama joked as the children laughed.

“In between singing wheels on the bus, we discussed our administration’s vision for this city – one where New York’s cutest have the strongest start possible,” Mamdani said about the meeting on an Instagram post.