"The richest thing about Donald Trump is his hypocrisy.

Michael Bloomberg, elected mayor of New York City as a Republican, offered a forceful denunciation of fellow New York billionaire Donald Trump on Wednesday at the Democratic convention, describing the GOP presidential nominee as a "risky, reckless, and radical choice."

One of the nation's richest men, Bloomberg drew upon his business background in his unorthodox convention speech in Philadelphia to make the case that a Trump administration would be disastrous for the nation's economy.

"Trump has left behind a well-documented record of bankruptcies and thousands of lawsuits and angry shareholders and contractors who feel cheated and disillusioned customers who feel ripped off," said Bloomberg, now an independent. "Trump says he wants to run the nation like he's running his business? God help us."

"Truth be told," said Bloomberg, "the richest thing about Donald Trump is his hypocrisy."