I mean, it's not like they've really used fact-checkers in any of the debates before, maybe after the debate is over, but they rarely fact-check them on the spot. I wish they'd have a running tally in front of the candidates that was updated throughout the debate with a general "truthiness" indicator. Just a dial gauge that gave an indication of how many statements the person had made vs how many were lies. It could be a way to attach a quantifiable "score" to a person's debate performance outside of just quips and one-liners.
She could turn it around though by mentioning all the campaign promises he didn't do like put Hillary in prison, building the wall was mostly done by Biden, drain the swamp when he just cut taxes for the rich...
Like really hammer home the promises he made to Fox viewers that he broke.
If she says "You didn't 'lock her up' like you promised" he'll just turn it around on her and claim that she should be locked up. Chats of "lock her up!" will begin as they completely ignore anything negative said about him.