Robert Mueller is up to his armpits in issues to peel away as he seeks to learn the truth about allegations that the Donald Trump presidential campaign colluded with Russians seeking to influence the 2016 election.

Now comes a book, “Fire and Fury,” by journalist Michael Wolff, in which a former key Trump aide — Stephen Bannon — has tossed out words like “unpatriotic” and “treasonous” to describe a meeting between Don Trump Jr., Jared Kushner and Paul Manafort and a Russian lawyer.

And, oh yes, it’s getting a lot muddier than it already has gotten.

Mueller, the special counsel appointed by the Justice Department, is now getting an even fuller plate. He might be buried up to his eyebrows in these issues relating to the allegations of collusion.

The president has issued a “cease and desist” order to Bannon; no more talking about the book, he has ordered. He’s also trying — in a stunning example of prior restraint — to keep “Fire and Fury” from being published.

And the media are continuing to report even more astonishing developments. Such as White House counsel Don McGahn being ordered to talk Attorney General Jeff Sessions out of recusing himself from looking into the Russia meddling matter. Um, who issued the order? Might it have been, ohhh, the president himself?

Trump has torched Bannon for speaking to Wolff. That, too, is fascinating in the extreme, considering that Wolff had been given astonishing access to White House sources.

Bannon’s view of the president? He continues to “support” Trump’s agenda and says there’s no daylight between them on the key issues of the day.

My head is spinning like Linda Blair’s noggin in “The Exorcist.”

I am believing that someone has poured sand into the president’s “fine-tuned machine.”

Moreover, the special counsel’s investigation well might have been given more fuel.

I cannot keep up with it. I need a good night’s sleep.