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Boris Johnson doesn't believe in Brexit and backed Leave in the referendum to help his own career, David Cameron has claimed.

The ex-Tory PM launched another stinging attack on Boris Johnson, claiming the Prime Minister is a liar.

He also brands Michael Gove was a “foam-flecked Faragist” whose “one quality” was disloyalty.

not to become "a w***er" in a foul-mouthed text, it emerged today.

The 52-year-old Tory, who quit as prime minister hours after Britain voted to leave the EU , hit out at both Mr Gove and Boris Johnson in a series of scathing rants.

Mr Cameron has revealed that Mr Johnson privately claimed there could be a "fresh renegotiation, followed by a second referendum" - which he now says he opposes.

In extracts from his forthcoming memoir, serialised in the Sunday Times, said Mr Gove and Johnson as the leaders of the Leave declared open warfare" on him - and claimed they were guilty of "lying" to the public to win the 2016 referendum.

(Image: PA)

Mr Cameron wrote that the now-Prime Minister wanted to become the "darling of the party" and "didn't want to risk allowing someone else with a high profile - Michael Gove in particular - to win that crown".

"The conclusion I am left with is that he risked an outcome he didn't believe in because it would help his political career."

On Mr Gove, the former PM said: "One quality shone through: disloyalty. Disloyalty to me and, later, disloyalty to Boris."

And he said Mr Gove's claim that the public were tired of experts made him "an ambassador for the truth-twisting age of populism".

(Image: PA)

"By the end, Boris and Michael seemed to me to be different people. Boris had backed something he didn't believe in.

"Michael had backed something he did perhaps believe in, but in the process had broken with his friends ... while taking up positions that were completely against his political identity.

"Both then behaved appallingly, attacking their own government, turning a blind eye to their side's unpleasant actions and becoming ambassadors for the expert-trashing, truth-twisting age of populism."

(Image: AFP/Getty Images)

not to become "a w***er" in a foul-mouthed text, it emerged today.

It comes after earlier extracts from the book saw Mr Cameron accuse Michael Gove and Boris Johnson of effectively "trashing" the government during the 2016 campaign and is fearful what will happen after Brexit .

But in a sensational admission, the former PM said he once texted Mr Gove, now Chancellor of the Duchy of Lancaster, to say: "You are either a team player or a w***er."

Mr Cameron said attacks by Priti Patel, who is now the Home Secretary, on his government's immigration record "shocked me most" but he did not want to fire her and create a "Brexit martyr".

He also says that Dominic Cummings, who is now a special adviser to the government. was part of a "cauldron of toxicity" with Nigel Farage.