Mark Cuban, the owner of the Dallas Mavericks, was invited by the Clinton campaign to sit in the front row at Monday night's debate.
"Just got a front row seat to watch @HillaryClinton overwhelm @realDonaldTrump at the "Humbling at Hofstra" on Monday," Cuban tweeted. "It Is On!"
A Clinton aide later confirmed that Cuban was, in fact, invited by the Clinton campaign.
"He has the best seat we have access to," the aide said.
Cuban has tried to publicly shame Trump throughout the 2016 campaign, regularly slamming the Republican nominee for not releasing his taxes. The attacks have been particularly effective, given Cuban's status as a fellow billionaire and his public persona as a similarly brash businessman.
"He has proven to be singularly effective in making the case against Trump and for Clinton," the aide adds. "That is why we invited him."
Clinton at a July event in his native Pittsburgh.
Afterwards, he told CNN That Trump was "bats--- crazy."
"Trump scares me," Cuban said after speaking at the event. "Donald, initially, I really hoped he would be something different, that as a businessperson, I thought there was an opportunity there. But then he went off the reservation and went bats--- crazy."
Cuban also said that he had talked to Trump before he endorsed Clinton and urged the real estate mogul-turned-candidate that at some point he had to adapt and learn policy.
"I told him directly, at some point you have to learn, at some point you have to read and that that job is all about uncertainty and if you don't do the work, that is not good for this country," Cuban said. "And he just doesn't do the work."
Recently, Cuban offered
Trump $10 million to the charity of his choice if her would sit down for an interview "for 4 hrs on YOUR policies and their substance."