Andy Burnham is facing a Labour revolt over reopening Brexit wars - amid signs of Cabinet rifts.

The PM used an interview yesterday to lean into the idea of returning to open borders with the EU as part of his bid for closer ties.

He suggested a referendum would be needed to revive free movement, saying he would 'never move ahead of the British public when it comes to Brexit'. 

The position descended into farce later as Downing Street insisted the public might not be given a vote on the issue after all.

No10 argued that the PM 'isn't proposing a return to free movement', despite claims it is already featuring in talks.

However, tensions are ramping up within Labour at the prospect of another toxic debate on borders. 

Melanie Onn, MP for Great Grimsby and Cleethorpes, warned that freedom of movement was a 'defining' factor in the Brexit vote. Any suggestion of reinstating the rules risked destroying 'trust', she said. 

The comments echoed previous concerns from Labour MPs in Brexit-backing constituencies.

Business Secretary Jonathan Reynolds, thought to be a sceptic of moves to rejoin the customs union and single market, dodged on the issue this morning.

Pressed whether he personally backed bringing back free movement, Mr Reynolds stressed he was giving the 'Government line'. 

He insisted the PM was just highlighting 'things the EU would ask for' in return for closer ties. 

Home Secretary Shabana Mahmood is also said to be 'furious' about the new row over freedom of movement - which has been seized on by Nigel Farage. 

During TV interviews yesterday, Mr Burnham said he wanted to start an 'honest conversation' about the merits of reviving the rules as part of a new deal with the EU.

'I don't think things have worked out as they said they would at the time, particularly when it comes to immigration,' he said.

He is planning to set out a series of options for a new relationship with Brussels at a UK-EU summit next month. They are expected to include membership of the single market and customs union, as well as fully rejoining the EU. 

Asked if free movement could be revived without a referendum, Mr Burnham said: 'No.'

But hours later No10 said the Government was 'not at the stage where we have concrete proposals'. 

A spokesman for the PM said, 'The Prime Minister isn't proposing a return to freedom of movement or any option,' even though he rolled the pitch for it in an interview with the Sunday Times. 

'He is saying that it's time for us to discuss what kind of long-term relationship with Europe is best for Britain and he is referring to the types of areas that that agreement and long-term future could cover.' 

The spokesman even suggested Mr Burnham's stated wish to rejoin the EU during his lifetime was a 'personal view' rather than government policy.

It was the second time this month that No10 has been forced to 'clarify' the PM's remarks on Brexit, after he suggested the 2016 referendum result was influenced by the Kremlin. 

Speaking on BBC Radio 4's Today programme, Mr Reynolds said 'no assumptions' have been made about what comes after next month's summit with the EU.

Pressed on whether UK officials are talking or planning to talk about freedom of movement, he said: 'They will be talking to them about what the future options for our relationship might be.

'But here and now, the focus should be on the summit and the tangible difference improvements we're going to make.'

Challenged on LBC whether he was personally in favour of free movement, Mr Reynolds said it was 'for the PM to set out'.

Told that is was 'not for the PM to set out how you feel Mr Reynolds', the Business Secretary replied: 'When Mr Reynolds is the business secretary he takes the line of the Government.'

'Our negotiations are focused solely on next month's summit and the practical agreements that we hope to make there that will add billions to the economy and cut the red tape that holds back British business.

'The deal that was initially negotiated was clearly not good enough, and the summit will go some way to addressing that.'

Mr Burnham will then set out 'next steps' on the UK's longer-term relationship with the EU around the time of the summit with the bloc's chiefs next month.

He will also set out details of how he plans to gauge public support for any proposals, she said.

In an article for Politics.co.uk, Ms Onn said freedom of movement was 'one of the defining issues of the 'once in a generation' Brexit referendum, for many it raised fundamental questions about immigration, contribution and fairness'.

'These concerns have not simply disappeared,' she warned.

'Reopening freedom of movement risks reigniting divisions when the country desperately needs a more constructive conversation.'

Ms Onn said 'perhaps most importantly' was the 'question of trust', as the 2024 Labour manifesto had been 'unequivocal' about not returning to the 'single market, the customs union, or freedom of movement'.

'That was a clear commitment made to the electorate, including in communities such as Great Grimsby and Cleethorpes, where the Brexit vote reflected a deep sense that Westminster had stopped listening,' she said.

'Political trust is hard won and easily lost. The perception that promises made at elections can subsequently be revisited by a political establishment removed from the realities of working communities has left lasting scars.'

Ms Onn said there were 'genuine opportunities for trade, growth and young people' in negotiations with the EU. 

'None of those ambitions depend on the reopening of the debate around freedom of movement,' she said.

'If the PM is serious about offering hope, there is no hope without trust.'