There he goes again: lying when he simply could remain silent, let alone tell the truth.

Donald Trump has said that every living former president supports his desire to build The Wall along our border with Mexico.

Oops! Except that they don’t.

Three of the four former presidents have declared that Trump hasn’t discussed the issue with him. Jimmy Carter has just joined Bill Clinton and George W. Bush in denying that they support building The Wall; Barack Obama has been quiet on this particular matter, but his views on The Wall already are well known.

“I have not discussed the border wall with President Trump, and do not support him on the issue,” President Carter said in a statement issued by the Carter Center in Atlanta.

So, I’ll ask the question once again: Why in the name of truth-telling does Donald Trump insist on tossing out these gratuitous lies?

Good grief! The guy can just keep his trap shut. He could simply that “others” support his goofy notion. But oh, no! He’s got to say that the former presidents of the United States have joined him in this idiocy. Except that all of them are of sound mind and are able to speak for themselves, and what do you know . . . they have disputed categorically what Trump has declared.

This is what I mean when I suggest that Donald Trump is so very indelicate and imprudent in his lying. He is a bad liar. He cannot control his impulse to lie when he doesn’t need to lie.

His lawyers all have questioned whether he should agree to talk to special counsel Robert Mueller about “The Russia Thing,” fearing that he could get caught in a “perjury trap.”

The president’s lying about the ex-presidents’ alleged “support” for The Wall now seems to affirm his counsels’ fear about the president committing perjury.