text:  My son was not a loser, was not a sucker. You're the sucker. You're the loser. President Biden and former President Trump sparred over the economy, wars overseas, illegal immigration, election integrity, and it got personal often. But much of the post-debate discussion is about President Biden's delivery, at times stammering, losing his train of thought. After one of those moments, former President Trump said, I really don't know what he said at the end of that sentence. I don't think he knows what he said either. Fox's Aisha Hosni reports.