Donald Trump might lose the election to Joe Biden ... but there's 1 place the prez says he'd never take an L to the former VP -- and that's in a fist fight.
Yes ... this happened.
President Trump was holding a rally in Bullhead City, AZ on Thursday ... when he revealed he once asked Dana White if the UFC honcho believed 77-year-old Biden would make a good fighter.
Here's how Trump says the convo unfolded.
"I don't think Sleepy Joe would be a good fighter.