Mamdani, the presumptive Democratic nominee to be the next mayor of New York City and a self-identified democratic socialist, on Sunday said billionaires contribute to inequality.

"I don't think that we should have billionaires, because, frankly, it is so much money in a moment of such inequality," Mamdani said.

The self-described Democratic Socialist also told "Meet the Press" there is no reason they should be billionaires in a country with so much inequality.