Amid a slate of speakers that included the nation's president and vice president, perhaps the most powerful voice at the Democratic National Convention Wednesday was that of billionaire and former New York mayor Michael Bloomberg.

The independent delivered a withering speech that dismantled the case for Republican presidential candidate Donald Trump based on his business acumen -- one of the key factors behind Trump's rise to presidential nominee.

At the convention as a self-proclaimed outsider to voice his support for Hillary Clinton, Bloomberg was also likely aiming to galvanize the disappointed "Bernie or Bust" voters into rallying behind the Democratic nominee, calling for them to elect a "sane, competent person, with international experience, a unifier who is mature enough to reach out for advice."

"It is imperative that we elect Hillary Clinton as the next president of the U.S," Bloomberg said, adding, "there are times when I disagree with Hillary Clinton, but ... whatever our disagreements may be, we must put them aside for the good of our country, and we must unite around the candidate who can defeat a dangerous demagogue."

Bloomberg, whose wealth as the world's eighth richest man dwarfs Trump's, issued some of the most scathing anti-Trump language of the Democratic National Convention so far.

Trump's actual net worth is unclear, since the presidential candidate has refused to release his income tax returns, breaking a long-running tradition. Every Republican nominee since Nixon has released his tax returns prior to the election, according to Politifact. 

Trump claims to be worth $10 billion, but fact checkers, evidently including Bloomberg, have questioned that figure. "Truth be told, the richest thing about Donald Trump is his hypocrisy," Bloomberg said.

The business magnate noted that, like Trump, he's an entrepreneur, but he didn't start his business with a $1 million check from his father.

Bloomberg then lambasted Trump for his well-documented record of bankruptcies, thousands of lawsuits, angry stockholders and contractors who feel cheated and disillusioned customers who feel they've been ripped off.

"Donald Trump wants to run our nation like he's running his business? God help us! I'm a New Yorker, and I know a con when I see one," Bloomberg said.

The media tycoon categorically blasted each point of Trump's business plan, saying, "Trump says he'll punish manufacturers that move to Mexico or China, but the clothes he sells are made overseas in low-wage factories. He says he wants to put Americans back to work, but he games the U.S. visa system so he can hire temporary foreign workers at low wages. He says he wants to deport 11 million undocumented people, but he seems to have no problem in hiring them. What'd I miss here?"

Bloomberg, whose own name has often been put forth as a potential presidential candidate after his successful 12-year stint as mayor of New York, said he understands the appeal of a businessman for president.

"But Trump's business plan is a disaster in the making," he said.

Among the consequences of a Trump presidency, Bloomberg listed that it would hurt small businesses' ability to compete, damage the U.S. economy, threaten the retirement savings of millions of Americans, lead to greater debt and more unemployment, erode U.S. influence around the world and make communities here less safe.

"The bottom line is Trump is a risky, reckless and radical choice and we can't afford to make that choice."

While condemning Trump, who has failed to garner support from prominent members of his own party, Bloomberg noted that like most independents, he feels neither party fully represents his views.

Bloomberg spoke about his experiences as post-9/11 mayor of New York when he worked with Hillary Clinton, saying he witnessed firsthand her ability to bring members of Congress together to "get big things done." 

"Now I know Hillary is not flawless -- no candidate is -- but she is the right choice and the responsible choice in this election ... And no matter what you may think about her politics or her record, Hillary Clinton understands that this is not reality television, this is reality," Bloomberg said.