Donald Trump surrogate Rudy Giuliani and Hillary Clinton surrogate Mark Cuban got really intense with each other in a two-segment fight on CNN tonight. Giuliani first went off on Clinton’s emails and said anyone else who did what she did would be under indictment. Cuban responded, “Everything you just said is incorrect.” They kept arguing back and forth on the emails and Giuliani repeatedly shouted, “Let me finish!” He pointed to Clinton not understanding the classification marking on an email but Cuban pushed back and said it was improperly marked. Cuban cried, “This is like out of The X-Files, Mayor Giuliani!” But it was on the issue of Trump’s businesses (which Giuliani brought up) that really got Cuban going. He called Trump a failure at almost everything he’s tried, said his toxic campaign has destroyed his brand, and he’s been sued thousands of times. Giuliani shot back, “People doing bold things sometimes fail.” But segment two was far more off the rails, thanks to Giuliani bringing up Bill Clinton‘s “illegitimate children” (a conspiracy theory that may get played out tonight) and declaring, in the middle of a fight on the former president’s sexual history, “Monica Lewinsky would be in an insane asylum if she didn’t have that dress!” Just hours before Wednesday night’s third presidential debate, CNN staged an undercard event between Trump surrogate Rudy Giuliani and billionaire Mark Cuban, a supporter of Hillary Clinton. After some disagreements over the importance of Clinton’s private email server, the two moved on to Trump’s business experience. “Name any of his products that are still successful,” Cuban charged. “He cheated — cheated — 6,000 people from Trump University. Hard working men and women, he took tens of thousands of dollars from them.” “Trump games, Trump cards, Trump steaks, Trump clothes,” the billionaire continued, listing Trump’s failed business ventures. “When somebody has to give their name and sell their name that often, that tells me they’re desperate. He has not had a long track record in business. He’s done okay in real estate, but everything else, he’s been a major failure at.”“Now he’s crushing his brand,” Cuban added. “And everything he says makes no sense because he’s crushing his brand even more.” Giuliani, however, asserted that Trump “has had great success in business.” “Then why all the failures?” Cuban interrupted. “He’s been sued 3,500 times, I’ve been sued less than 10.” Watch part 1 of the debate below.