Former national security adviser John Bolton wrote it out plainly and simply to Donald J. Trump.

“I hereby resign, effective immediately, as Assistant to the President for National Security Affairs. Thank you for having afforded me this opportunity to serve our country.”

The letter is dated Sept. 10. That would be, um, Tuesday … of this week.

The president said he sought Bolton’s resignation. Bolton said he gave it on his own.

Who’s telling the truth? Well, you know how I feel about Trump. I don’t believe anything he says. Not at any level. On any subject. Nothing, man! Zero.

Therefore, I am inclined to believe Bolton.

Let me be clear: I do not want John Bolton advising any president on national security matters. He’s a warmonger. He’d rather hurl bombs at our enemies than seek diplomatic solutions.

Trump said he has disagreed with the advice Bolton gave him. At some level, I wish I could believe the president. Then again, I’ve already stated once again that I believe nothing from this man.

Oh, the quandary.

The bigger question facing the nation is seeking to find someone who can work with the president. Who in the world who is worth a damn would stomach working for someone who is so prone to disagreeing with advice he gets from supposed experts on matters such as, say … national security?

Trump has said he’s an expert on every subject known to humanity. That must include ways to protect this nation against its enemies.

Heaven help us.