Former New York mayor Michael Bloomberg stepped into the spotlight this week appearing on stage for a debate with five other candidates for the Democratic nomination.
The billionaire has already spent US$464 million on his campaign but avoided the Iowa caucuses and the primary in New Hampshire.
He faces ongoing criticism for his support of "stop and frisk", a practice which allowed police to search suspects without a warrant. Over 80% of those stopped were non-white.
Kim spoke with Nicholas Kulish, an investigative correspondent for The New York Times who has been taking a deep dive into how Bloomberg has been using his wealth and charitable giving to influence the leadership contest.