The frontrunner to win the Labour leadership has said he would not share a stage with David Cameron during the EU referendum campaign.
Jeremy Corbyn, who polls show with a large lead over his rivals, has said he is not content with the current state of the EU but would not campaign to leave.
But asked by the Press Association news agency whether he would share a platform with David Cameron as part of the campaign to stay in, Mr Corbyn simply replied: “No.”
At the start of his campaign Mr Corbyn was coy on whether he would support EU membership as leader, but he has now said he would work with allies across the continent to “create a better Europe”.
His refusal to work with the prime minister comes after a report in the Sunday Times newspaper that Mr Cameron would orchestrate a “choreographed” row with the French government over the EU.
The UK will have a referendum on the European Union by 2017 but the Prime Minister has previously hinted that it could be held earlier.
Some figures on the political left have urged Labour to consider supporting withdrawal from the European Union.
Labour’s decision to present a united front with the Conservatives during the Scottish independence referendum campaign has been blamed by some observers for the party’s complete collapse in Scotland.
Eurosceptic Tory MPs
Eurosceptic Tory MPs
1/7 Owen Paterson
Formerly a cabinet minister, Owen Paterson is now free to make his opinion known on the backbenchers. On the subject of Europe, he does so regularly – claiming recently that the EU referendum was “rigged” in favour of staying in
2/7 John Redwood
A longstanding eurosceptic, Mr Redwood warned last year that businesses that spoke out in favour of EU membership would be punished at the check-outs by anti-EU
3/7 Bill Cash
Awkward squad rebel Bill Cash said last year that he thought the EU had become an undemocratic, German-dominated project. “An increasingly assertive German Europe is at odds with British national interests,” he wrote in the Daily Telegraph
4/7 Philip Davies
From the Conservative party’s hard right wing, Philip Davies has been a longstanding critic of the EU. He founded the Better off Out campaign and is so eurosceptic that Ukip decided not to stand a candidate against him in 2010 because they agreed with him
5/7 Nadine Dorries
Outspoken Tory MP Nadine Dorries has previously advocated an alliance with Ukip. At the height of the Greek crisis in 2013 she said that the EU was “dying on its feet”
6/7 Liam Fox
The former defence secretary is a central figure on the right wing of the Conservative party. He’s long put pressure on David Cameron over EU negotiations
7/7 Zac Goldsmith
A socially liberal eurosceptic, Goldsmith was one of the founding members of the People’s Pledge campaign to get MPs to sign up for an EU referendum. His father ran the Referendum Party, a precursor to Ukip
The party’s experience north of the border could be informing Mr Corbyn’s thinking with regards to the upcoming plebiscite.
Voting in the Labour leadership election began this week. The results will be announced at a special party conference in September.
The other candidates are Yvette Cooper, Liz Kendall, and Andy Burnham.
In separate question and answer sessions the other candidates gave negative but slightly less emphatic responses. Ms Cooper said it was not right to do "deals and pacts", Ms Kendall said she had "no desire" to share a stage with Mr Cameron, and Mr Burnham said he "wouldn't be planning to".