All presidents lie. But most presidents tend to lie about secrets, which make the lies hard to refute.
Bill Clinton said, “I did not have sex with that woman, Miss Lewinsky” when only he and Miss Lewinsky knew the truth.
Richard Nixon said, “I am not a crook” when he was hiding the evidence of his crimes.
George W. Bush said that Saddam Hussein had weapons of mass destruction and ties to Al-Qaeda when very few people could prove otherwise.
Donald Trump is different. He lies about things on video, in print, and in other places that anyone can see.
Maybe he’s so firm (or so insecure) in his beliefs that he simply can’t accept contradictory evidence. Maybe he’s like the religious authorities who wouldn’t admit that the Earth circles the sun or the apocryphal dirt farmer who looked at an exotic beast from another continent and said, “There ain’t no such animal.”
Or maybe Mr. Trump believes that if he says something forcefully enough, people will believe it. To use a joke that I’ve mentioned before, maybe he’s like the husband whose wife catches him cheating, so he denies it, saying, “Who are you going to believe, me or your lying eyes?”
In any case, Mr. Trump’s lies are much, much bigger than the usual presidential lies. I find that fact alarming.