Donald John Trump blasted Bob Woodward’s new book, “Fear,” saying — among many other things — that he has never used the word “retard” to describe a fellow human being.

Except … that he did.

Woodward’s book contains a passage that references the president calling Attorney General Jeff Sessions “mentally retarded” and a “dumb Southerner.” Trump said he’s never used that word. Never. Not one time, he said.

Oops! Someone dug this item out, from a 2004 appearance on Howard Stern’s radio show: “I know I was criticized in one magazine where the writer was retarded, he said: ‘Donald Trump put up $7 million, they put up $193 million and they are 50/50 partners. Why isn’t Donald Trump putting up more money?’ And you know it is supposed to be because I am smart.”

This is the kind of thing that keeps nipping at the president’s rear end. He makes blanket assertions that can be refuted immediately.

Such is the case, yet again, with the president’s “retarded” description of the attorney general. Yes, it seems to validate Woodward’s credibility as a journalist.

If only the president could ever learn to speak the truth. About anything. He won’t.