“He has the best seat we have access to,” the aide told the cable news network Thursday. “[Cuban] has proven to be singularly effective in making the case against Trump and for Clinton. That is why we invited him.”

Cuban has repeatedly questioned Trump’s qualifications, most memorably calling him “bats— crazy” at a July campaign event in Pittsburgh, where he also formally endorsed Clinton.

“Trump scares me,” Cuban said (via CNN) directly after addressing the crowd. “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.”

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In his latest effort to dog Trump, Cuban offered Trump $10 million to the charity of his choice in exchange for an uninterrupted four-hour interview about Trump’s policies that would supposedly “make America great again.” Trump, who has been notoriously tight-lipped about laying out specific plans for the country, has so far declined that offer.

Cuban’s opinions on Trump in 2016 are a far cry from where they were a year ago. In July 2015, Cuban, like Trump a reality TV star, said (via Business Insider) he would consider running for office with Trump given the right political climate. He changed his tune later, however, noting that as long as the Republican party remained socially conservative, he probably wouldn’t throw his hat in that ring.

Cuban hasn’t specified whether he’ll try to speak with Trump at the debate on Monday, but one thing’s probably certain: We’re all hoping there will be be an intense stare-down, judging from the boxing allusions he included in his tweet on Thursday (“It Is On!”).