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Mutinous Tory MPs are set to tell Boris Johnson to boot out his hated adviser Dominic Cummings.

A furious delegation of around a dozen will arrive at the Prime Minister’s office this week amid growing calls to rein in his right-hand man.

The coup could take place as soon as tomorrow, sources said, as Parliament’s bill ruling out a no-deal Brexit receives Royal assent.

The group will approach the chief whip plus Mr Johnson’s parliamentary private secretary Alex Burghart, and the PM himself.

A source said: “They are going to lay it on the line for him. Cummings is poisonous.”

(Image: Steve Bainbridge)

MPs including some of the PM’s Cabinet ministers are angry that Mr Johnson kicked 21 rebels out of the party on Cummings’ advice.

They believe the man who wheedled himself into the position of the PM's effective chief of staff wields too much power for an unelected adviser. And they blame him for giving the PM duff advice because, though a brilliant Vote Leave campaigner in the 2016 EU referendum, he does not understand Parliament.

The Sunday Mirror can reveal that former Conservative Party vice chairman Sir Roger Gale confronted the PM after his foul-mouthed sidekick threatened an ex-cabinet minister.

The expletive-laden call came as Mr Cummings threatened former Business Secretary Greg Clark that he would be “purged” if he stepped out of line in Tuesday’s vote paving the way for a Bill to rule out a no-deal Brexit.

Mr Cummings said: “When are you f***ing MPs going to realise we are leaving on October 31? We are going to purge you.”

The whip was later withdrawn from the MPs who rebelled, banning them from standing as Tories at the election.

Sir Roger, MP for North Thanet for 36 years, said: “I believe very strongly some of my respected colleagues were treated disgracefully by Cummings. When I used the phrase, ‘Unelected foul-mouthed oaf’ that's exactly what I meant. That’s why I said it.

“I’ve subsequently said to the Prime Minister, ‘I think you can’t have this’.

“Greg Clark, who was sworn at, is one of the most mild-mannered men you could meet and meticulous in his treatment of members.”

Sir Roger, 76, added: “This kind of tirade is not acceptable. I said to the Prime Minister, ‘You’ve got to do something about this, it’s going to rebound on you’.”

(Image: Isle of Thanet Gazette)

A Commons source said Mr Cummings “swears at most people he meets”, adding: “It was at the Prime Minister’s instigation that the phone call took place.

“It was basically Cummings giving him a bollocking in a conversation that was encouraged by the Prime Minister.

“Cummings is out of control and it’s time for the Prime Minister to take back control. It’s Cummings who’s calling all the shots. Boris is not a details person, he’s just the front man.”

The former cabinet member said if Mr Johnson was forced to try to invite back the 21 MPs who had the whip withdrawn it was “highly unlikely” any would return until Mr Cummings was gone from Number 10.

Another Whitehall insider said politicians and civil servants were “frightened” of Mr Cummings, and said nobody expected the Vote Leave architect to still be in post by Christmas.

He said: “They are scared of him. I don’t know anyone who assumes he’s here for the long haul. He treats people like pawns – look at what he said the other day to really well-respected backbenchers: ‘I haven’t even heard of you’.”

Meanwhile ex-Tory MP Anna Soubry pulled out of speaking at a rally in Parliament Square yesterday as clashes broke out between supporters and opponents of Brexit.

The Change UK leader said the unrest, which also saw a Boris Johnson blimp withdrawn in case it became a target, was “frightening and disturbing”.