Dear Mr. President,

I have no idea whether you or your staff reads the stuff that comes from this blog, but I’ll offer this bit of advice anyway.

Say you’re sorry for defaming Barack Obama. Admit you made a mistake. Come clean with an admission that you woke up one morning, that you weren’t quite awake or alert before you blurted out that tweet in which you accused the former president of wiretapping your campaign offices at Trump Tower.

The jig’s up, Mr. President. The FBI director, the guy who many Democrats believe torpedoed Hillary Clinton’s campaign with that e-mail-related letter to Congress on the eve of the election, has just blown your wiretapping tweet to bits.

He said he has no information to confirm what you have alleged. He said the Justice Department has no information either in any of its branch offices.

I get that you don’t apologize. I’ve heard all that stuff about you — and from you, sir. I have read about how you said you’ve never sought forgiveness.

Take my word for it, Mr. President: an apology doesn’t signal weakness. On the contrary, it signals strength. It tells us that you are man enough to own up to making a mistake.

Mr. President, you need a serious reset here. These tweets of yours are damaging the country at many levels. They compromise our national security; they send bizarre messages to our allies; they make you sound like a know-nothing teenager.

In the case of the Obama wiretapping allegation — which the FBI director has shot down in flames — they expose you to accusations of slander and defamation.

C’mon, Mr. President. Just say you’re sorry. Pledge to us you’ll close your Twitter account, and then do it.

The presidency deserves to be occupied by a grownup.

So far, sir, you aren’t acting like one.