John Kelly is about to take on the job of his nightmares.

He is the next White House chief of staff, replacing Reince Priebus, who was booted out of his job this week by the president of the United States, one Donald John Trump.

The president, moreover, has hired a communications director who is exhibiting the conduct of a madman. Anthony “Mooch” Scaramucci went on a profanity-laced tirade and predicted correctly that Priebus would be gone by the end of the week.

Now into this maelstrom comes Kelly, a retired Marine Corps general. He is a no-nonsense general-grade officer. He has served his country heroically and with supreme honor. He moves into the White House from the Department of Homeland Security, where he served as secretary.

It’s the Kelly vs. Mooch situation that ought to cause concern throughout the massive federal government.

Mooch reports to the Donald Trump. Tradition — something for which the president has zero regard — has made the communications director answer to the chief of staff.

Here’s my question: How long will it take Gen. Kelly to slap some sense into Mooch and tell this loudmouth that the chief of staff controls the message?

It’s being said in recent hours and days that no previous president would have put up with the hideous tirade that Mooch launched against Priebus. Mooch called Priebus a “schizophrenic,” adding a colorful f-bomb adjective in front of that term.

Can you imagine someone referring to, say, previous WH chiefs Leon Panetta or James Baker III with that kind of language?

With all of that said, Gen. John Kelly is walking into a White House that is in an utter state of confusion and chaos. It’s a direct reflection of the man who refused to let the previous White House chief of staff do his job.

Moreover, it all reflects directly on the incompetence demonstrated daily by Donald John Trump Sr.

Good luck to you, Gen. Kelly. You will need every bit of it.