Labour grandee Lord Mandelson has accused party leader Jeremy Corbyn of sabotaging the campaign to keep Britain in the EU, in a BBC programme that will be shown on Monday night.
Former European commissioner Mandelson said Corbyn’s stance had “greatly damaged” the Remain campaign and “held back” the efforts of the Labour In team, The Press Association reported.
He said Remain campaigners were left puzzling over whether the Labour leader - who told a chat show during the campaign that he would only rate the EU seven out of 10 - really wanted Britain to stay in the EU.
“Or was there something deeper - did he simply not want to find himself on the same side as the Prime Minister and the Government? Or perhaps he just deep down actually doesn’t think we should remain in the European Union? Who knows?”
Lord Mandelson added: “We were greatly damaged by Jeremy Corbyn’s stance, no doubt at all about that.
“Not only was he most of the time absent from the battle, but he was holding back the efforts of Alan Johnson and the Labour In campaign. I mean they felt undermined, at times they felt actually their efforts were being sabotaged by Jeremy Corbyn and the people around him.”
Mr Corbyn came under attack from within Labour ranks for what was widely seen as a half-hearted campaign, in which he refused to join politicians from other parties on Britain Stronger In Europe (BSIE) platforms, opting instead to work with the single-party Labour In group.
The head of the official Remain campaign, former Labour election candidate Will Straw, said he felt “let down” by Mr Corbyn’s “lukewarm” support in the referendum, complaining that it took six months for him even to secure a meeting with one of the leader’s advisers.
Mr Straw, who was executive director of the BSIE campaign, told the programme: “With just a couple of weeks to go there were far too many people who didn’t know Labour’s position on the referendum.
“And I think that was because of a lack of concerted campaigning by the leadership over many months leading up to that point ... I felt let down, yes.”
Shadow foreign secretary Emily Thornberry defended Mr Corbyn’s campaign, telling the programme: “I think that all leading members of the Labour Party were out actively campaigning ... and Jeremy played his part in that collective effort by doing a lot of media appearances, by doing a lot of, a lot of meetings up and down the country.
“He played his part and we all played our part in campaigning for that. I think that we are now going through a factious time in the Labour Party, clearly, but I don’t think that it’s appropriate for people to try to blame one individual.”
A spokesperson for Corbyn said the Labour leader refused to share a platform with the Tories as “it was crucial that the mistakes of the Scottish Independence Referendum were not repeated.”
The spokesperson added: “It is surprising to hear Peter Mandelson blame Jeremy Corbyn for Brexit so soon after giving a speech in Singapore where he blamed New Labour.
“He said that in New Labour’s enthusiasm for globalisation, they didn’t understand that the benefits of economic growth would go to so few people, while so many others were left with reduced job security, stagnant pay and greater pressure on public services and housing.
“These issues are the root cause of anti-immigration sentiment, which Mandelson accepted responsibility for, saying centrists had failed to communicate the benefits of immigration effectively and failed to spend more on public services and redistribution.”
Lord Mandelson was also critical of Mr Cameron’s handling of the referendum, accusing him of “holding back” the Remain campaign because of his unwillingness to go on the attack against fellow Tories.
Mr Clegg said that in discussions before the 2015 general election, Mr Cameron had brushed off his warnings that holding a referendum would be a risk.
“I said to him ‘I can’t get my head round this European gamble you’ve taken, are you sure you know what you wish for?’” said the former deputy prime minister.
“And I remember at the time David Cameron sort of very breezily saying: ‘Oh of course it’ll be won, of course it’ll be won.’ I said: ‘Well, I’m really not so sure.’”
The former Liberal Democrat leader said he had no doubt that Mr Gove was to blame for one of the most controversial moments of the campaign, when a discussion he had supposedly had with the Queen was anonymously leaked to The Sun.
“Michael Gove obviously communicated it, well I know he did, he gave this to The Sun,” said Mr Clegg.
“I know that. He leaked that and I can see why he might think that’s an interesting thing to do to try and drag the Queen into it, but it didn’t happen.”
Brexit - The Battle for Britain can be seen on BBC2 at 9pm on Monday August 8.