Richard A. Friedman: How to debate someone who lies

When Joe Biden debates President Trump on Tuesday, he will have to figure out how to parry with an opponent who habitually lies and doesn’t play by the rules.As a psychiatrist, I’d like to offer Biden some advice: Don’t waste your time fact-checking the president. If you attempt to counter every falsehood or distortion that Trump serves up, you will cede control of the debate. And, by trying to correct him, you will paradoxically strengthen the misinformation rather than underm