What's going to happen is s question will be asked, and trump will either make something up or straight up lie about his position. The mediator will correct him, and then trump will whine that the debates were rigged against him, and run away like the coward he is, and not do any more debates.
Trump is a thin skinned, whiny, entitled child, and just s pathetic human overall. The delusions of people like you will be shattered in November. It will be hilarious to hear you whine about how the election was rigged, when you can't accept the reality the Trump is one of the most unqualified people ever to run for the office of president.
Keep in mind, more people voted for his opponents than him. He couldn't even get s majority of his own party to vote for him. SAD!