A war of words has erupted between Zohran Mamdani and billionaire Ken Griffin over the New York mayor's vow to "tax the rich".
The founder and chief executive of hedge fund Citadel, who also owns America's most expensive apartment, said Mamdani was "making it really clear: New York doesn't welcome success".
Griffin said he would "double down" focusing on Miami to grow his business interests rather than Manhattan.
Mamdani filmed a video in April outside Griffin's New York penthouse to promote a new tax on luxury properties in the city.
Speaking on Tuesday at the Milken Institute Global Conference in Beverly Hills, California, Griffin said Mamdani's video was "creepy and weird".
