Like the 2020 election Trump is saying he won the debate.
The consensus is that Kamala Harris was perceived to have "won" by just relentlessly insulting Trump and getting him angry.
But that Kamala Harris didn't expand beyond her base or persuade independents she needs, that 6 in 10 independents after the debate now support Trump. But by that measure, it was Trump who won the debate. And why Kamala Harris is desperate for another debate, because beyond insulting Trump she gave no facts in the first debate to persuade independents.