Tony Blair has issued yet another warning to Labour supporters to reject the "Alice in Wonderland" appeal of Jeremy Corbyn or risk driving the party into an abyss.
Defying appeals from the leadership candidates to resist further interventions, he issued a fresh warning that the party would become unelectable.
Writing in The Observer, the former prime minister said he had as yet failed to understand the "powerful" phenomenon behind Corbyn's popularity and mocked those behind it for embracing a "politics of parallel reality."
All the evidence showed Labour lost the 2015 election because it was "anti-business and too left" and had no credible economic plan, he said.
It is like a driver coming to a roadblock on a road they've never travelled before and three grizzled veterans say: 'Don't go any further, we have been up and down this road many times and we're warning you there are falling rocks, mudslides, dangerous hairpin bends and then a sheer drop'.
In the Alice in Wonderland world this parallel reality has created, it is we who are backward looking for pointing out that the Corbyn programme is exactly what we fought and lost on 30 years ago, not him for having it.
With less than two weeks until the result of the Labour leadership election is announced, Mr Corbyn remains the bookmakers' overwhelming favourite to pull off a shock win.
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Tony Blair has not pulled his punches in a series of attacks on the left-wing candidate for the Labour leadership election.
He told people who wanted to vote with their heart for Corbyn to "get a transplant" in a major speech today, and admitted that even if he could win on a left-wing platform, he wouldn't want to.
Former Labour Tony Blair has argued that the party needs a return to the centre ground.
In a speech this morning, he also said that left-wing candidate Jeremy Corbyn was "the Tory preference" for leader.
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Former UK Prime Minister Tony Blair has submitted his resignation as Middle East peace envoy, an official has said.
Diplomatic sources revealed Mr Blair had written to United Nations Secretary-General Ban Ki-moon announcing his resignation as representative of the Quartet of Middle East powerbrokers at the end of June.
He took up the role immediately after stepping down as UK Prime Minister in 2007.
No comment has been made by Mr Blair's office in London.