Former Vice President Joe Biden got into a verbal altercation with billionaire hedge fund manager Bill Ackman after he disrespected his deceased son.

Via Fox News:

The controversial hedge fund manager, known for his losing bets on stocks like Herbalife (HLF) and Valeant (VRX), got into a verbal tussle with Biden at a private dinner during recent investment conference. The incident, which hasn’t’ been reported, stunned an A-list group of attendees who witnessed Biden’s verbally scolding Ackman, according to three people who were present.

The altercation occurred at this year’s SkyBridge Alternatives (SALT) Conference, a popular Wall Street confab held in May and started by hedge fund impresario Anthony Scaramucci. Both Biden and Ackman were featured speakers during the event.

Then during a private VIP dinner that night the question of why Biden didn’t run for president in 2016 was raised once again, by former Florida governor and 2016 GOP presidential contender Jeb Bush, who asked Biden “why didn’t you run?”

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Biden explained that part of the decision stemmed from the death of his son Beau Biden, who died of brain cancer in 2015. The room grew quiet as Biden became emotional, and said: “I’m sorry…I’ve said enough.”

That’s when Ackman blurted out “Why? That’s never stopped you before.”

The formal, and understated dinner conversation suddenly turned tense, according to three people who were present and confirmed both the substance and the wording of Biden’s responses.

Biden, these people say, turned to someone seated near him, and asked, “who is this asshole?,” a reference to Ackman.

Then he turned directly to Ackman and stated: “look, I don’t know who you are, wiseass, but never disrespect the memory of my dead son!” these people say.

Ackman attempted what was described as an apology, to which Biden said, “just shut the hell up”