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Nigel Farage will unveil his threat to the Tories on Monday when he reveals the 600 candidates who could split the Leave vote and scupper Boris Johnson’s chances of electoral victory.

The Brexit Party leader has failed to get a hardline Brexit alliance with the Prime Minister, even despite garnering the blessing of their mutual ally Donald Trump for the move.

But, while ruling out running as an MP himself , Mr Farage will introduce the hopefuls to challenge seats across the nation during the December 12 vote at an event in Westminster.

The MEP, who demands leaving the EU without a deal, said he could “serve the cause better traversing the length” of the country than himself running – and potentially failing – as an MP for an eighth time.

The unveiling comes after Steve Baker, the chair of the European Research Group band of hardline Tory Brexiteers, warned that Mr Farage is risking creating a hung Parliament by “dogmatically pursuing purity”.

In a blistering attack, Mr Baker told the Telegraph: “That’s the irony of Nigel Farage. He risks being the man who hands Boris a weak and indecisive Parliament, and bringing about, therefore, his own worst fears.”

Yesterday the PM apologised to the Tory members who elected him leader for failing on his “do–or–die” promise to implement Brexit by Halloween.

Mr Johnson said he feels “deep regret” over missing the former deadline, which he was compelled to extend to the end of January.

In an interview with Sky’s Ridge on Sunday, he was told he needed to take responsibility and could not just blame other people.

“Well, I do. I do and I’m deeply, deeply disappointed,” the PM replied.

Pushed on whether he would apologise to Tory members who supported him, Mr Johnson replied: “Of course, of course.

“It’s a matter of ... it’s a matter of deep regret.”

On the opposite side of the Brexit spectrum, the Lib Dems were not ruling out forming a Remain electoral alliance in up to 60 seats to boost the chances of preventing a Conservative majority.

Talks have been under way between the unequivocally pro–EU parties of the Lib Dems, Plaid Cymru and the Greens to boost the chances of electing anti–Brexit MPs.

Lib Dem leader Jo Swinson told Sky: “I wouldn’t necessarily assume that the numbers are accurate.

“I think it’s fair to say that in the vast majority of constituencies the party of Remain that is going to be best–placed to win that seat will be the Liberal Democrats.”

Labour’s Rebecca Long–Bailey confirmed that the party could campaign to leave the EU in a second referendum if it secures a strong enough new Brexit deal from Brussels.

“Ultimately underpinning our final decision is how good that deal is,” the shadow business secretary told Sky.

Additional reporting by PA Media