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Former Prime Minister Sir John Major will today sensationally call on the public to vote AGAINST the Tories in three seats at next week's election.

Sir John, who led the Conservative Party between 1990 and 1997, will back rebel candidates standing against Boris Johnson loyalists in a hammer blow for the PM.

He and ex-Labour Prime Minister Tony Blair will address a rally in London saying next week's vote is the "final chance" to affect Brexit.

Sir John said he is backing former Tory ministers David Gauke, Dominic Grieve and Anne Milton, who were booted out by Boris Johnson.

The trio are standing as independents against Conservative candidates.

In a pre-recorded speech ahead of the Stop the Brexit Landslide rally - organised by Final Say campaigners - Sir John will say old "tribal loyalties" are being loosened by Brexit.

It comes after Lord Heseltine said lifelong Tory voters should back the Lib Dems in order to stop Mr Johnson's Brexit.

(Image: PA) (Image: POOL/AFP via Getty Images)

In an extraordinary move Sir John will endorse the three former ministers, who were expelled by Mr Johnson in September, stating: “Let me make one thing absolutely clear: none of them has left the Conservative Party, the Conservative Party has left them.

"Without such talent on its benches, Parliament will be the poorer, which is why – if I were resident in any one of their constituencies – they would have my vote.”

Sir John described Brexit as “the worst foreign policy decision in my lifetime", saying: “It will affect nearly every single aspect of our lives for many decades to come.

(Image: PA)

"It will make our country poorer and weaker. It will hurt most those who have least.

"Never have the stakes been higher, especially for the young. Brexit may even break up our historic United Kingdom.”

Sir John's speech will continue: “When the nation voted on Brexit they did so on a diet of fiction and undeliverable promises.

"As the facts become known, it is extraordinary that a new vote is denied: extraordinary, and undemocratic."

He will state: “Your vote is absolutely crucial – for you have the longest lease on our country’s future, and our place in the wider world…

"Don’t wake up on Friday, 13 December and regret not making a choice.

"So choose the future you believe in – for your own generation and the next.”

(Image: https://www.theparliamentaryreview.co.uk/events/annual-gala)

Tony Blair is set to urge voters to deny Mr Johnson a majority in next week's vote.

He is expected to tell audience members: “Do not give Boris Johnson a majority.

“This Conservative Party which now expels the likes of Michael Heseltine, disowns the statesmanship of John Major, a party whose Chancellor as of July this year is now exiled in the wilderness for the temerity to say what he knows to be true, namely that a No Deal Brexit is a risk no responsible Government would take, such a Conservative Party does not deserve to govern unchecked and the country would not be wise to let them.

“It's not Brexit that's getting done. We're getting done.

"This is the final chance for a final say. It's not one General Election but 650 individual ones.

"Think long. Think hard. Time to choose. Choose wisely.”

(Image: PA)

In response, Mr Johnson said Sir John is "wrong" to have endorsed the trio.

He stated: "I think it's very sad and I think that he is wrong, and I think that he represents a view that is outdated, alas, greatly that I respect him and his record, and I think that what we need to do now is honour the will of the people and get Brexit done."

Mr Gauke, who is standing as an independent in South West Hertfordshire, will say this evening: "This general election is about Brexit.

“And for my former party it is about one sound bite ‘get Brexit done’. It is an offer to the country that is fundamentally dishonest.

"If we follow Boris Johnson’s plan, then we are guaranteed to be dealing with Brexit for years ahead.

"Rather than putting it behind us, we’ll be plunged into a negotiation that looks doomed to see us leave on WTO terms at the end of next year and yet more years of uncertainty.

(Image: PA)

"I worked to find a compromise that sought to mitigate the worst effects of Brexit but the hardliners in my former Party wouldn’t accept anything other than the hardest of hard Brexit.

“Now the choices are very stark. The country is polarised. It is either a hard Brexit or remain.

"Neither option has a mandate from the 2016 referendum. I believe we need to put those options back to the British people in a confirmatory referendum. And in those circumstances, it is overwhelmingly in the national interest to Remain.”

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Last week Conservative grandee Lord Heseltine, 86, who served under Margaret Thatcher and John Major, made a dramatic plea to die-hard Conservatives to "put the country first".

Asked what advice he would give to long-time Tory voters, Lord Heseltine said: "I'm telling them to vote for what they believe and what the Conservative Party has stood for all my life and certainly all of theirs - and to put country first.

"And what I think that means in practical terms is they either vote for the defrocked Conservative candidates, of which we have three excellent examples here, or they vote Lib Dem."