David Cameron has buried his differences with Sadiq Khan to campaign against Brexit - just weeks after condemning his links with extremists.

The Prime Minister lavished praise on the newly-installed London Mayor despite admitting that the pair did not always agree.

But Leave supporters said Mr Cameron's insistence that he was 'proud' to stand alongside Mr Khan was just was another example of his 'flip-flopping'.

David Cameron and Sadiq Khan were campaigning for a Remain vote in the EU referendum at an event in Roehampton, south west London.

The campaign rally in Roehampton, south west London, came with Tory tensions at their highest yet.

Sir Bill Cash today followed colleagues Nadine Dorries and Andrew Bridgen in publicly stating that Mr Cameron might have to go for peddling 'monumentally misleading propaganda' during the campaign.

Journalists were not invited to the Stronger In event in Roehampton this morning, where the PM and Mr Khan unveiled a 'guarantee card' featuring five pledges for if the country votes to keep ties with Brussels on June 23.

They include 'Full Access to the EU's single market' and 'Workers' rights protected'.

WHY ARE TORY BACKBENCHERS SO FURIOUS WITH DAVID CAMERON? David Cameron has warned of war and recession during the referendum campaign The anger of Eurosceptics at the way David Cameron has pursued the EU referendum campaign could end his premiership even if he wins. The main accusation levelled at the Prime Minister is that he has abused government machinery and resources in a bid to skew the result in his favour. Some £9million of public funds was used to produce, promote and deliver pro-EU leaflets to every household in the country. Treasury officials also prepared a series of assessments predicting economic catastrophe if we Leave - including claims that we would lose £4,300 per household and property prices would slip. The way the figures were presented, and the way respected bodies like the IMF, OECD and Bank of England have popped up to offer similarly apocalyptic predictions, was enough to anger many Tories in itself. Backbencher Marcus Fysh spoke for many when he bluntly declared that the assertions were 'b******s'. But the blood-curdling language deployed by Mr Cameron inflamed tensions even further. The PM has branded Brexit 'self-destruct' option,and even suggested leaving could trigger another war in Europe. Mid Beds MP Nadine Dorries yesterday voiced particular fury at Mr Cameron's insistence that Turkey joining the EU was 'not on the cards'. Advertisement

Mr Cameron held out an olive branch to Mr Khan in the wake of his attacks during the mayoral campaign.

The most high-profile came during a rowdy PMQs session, when Mr Cameron accused Mr Khan of sharing a platform with an Isis supporter.

'Anyone can make a mistake about who they appear on a platform with ... but if someone does it time after time after time, it is right to question their judgment,’ the PM said last month to howls of protest from Labour.

He subsequently apologised for the remark after Mr Khan defeated Tory candidate Zac Goldsmith, blaming a 'misunderstanding'.

Mr Cameron said today that he was 'proud' to be standing with Mr Khan.

'In one generation, someone who is a proud Muslim, a proud Brit and a proud Londoner can become mayor of the greatest city on earth – that says something about our country,' the premier said.

'Yes, there are still barriers to opportunity that we have to get rid of, there are still glass ceilings we have got to smash, there is still discrimination in our country that we have to fight.

'But I have always said, and I say it again today standing alongside our new mayor, that we can claim to be on track to be the best multi-faith, multi-ethnic, multi-opportunity democracy anywhere on earth.'

Mr Cameron said they would continue to disagree about many issues, but both believed that remaining in the EU was the 'best thing' for the country.

'Sadiq and I (support Remain) for this reason, which is that we love our country,' Mr Cameron insisted. 'We want our country to be the best it possibly can.'

In an apparently acknowledgement of the fury on Tory benches about his tactics, the premier said he would try to be 'positive' for the rest of the campaign.

'I will do everything I can over the next 24 days to speak clearly and speak positively ... this is the right course for our country,' he said.

But he again classed himself as a Eurosceptic - a description that has infuriated Conservatives in the past.

'I myself am a Eurosceptic. I am sceptical about some of the things that Europe has done,' Mr Cameron said.

Mr Khan urged young people to register to vote, saying the referendum would have implications far into the future:

'We are wealthier, we are healthier and we are better educated than many, many others of previous generations,' he told the campaign rally.

'And why is that? It's because of good decisions taken by previous generations.

'But now it's our turn to make decisions that will affect future generations to come.'

Ukip MP Douglas Carswell said Mr Cameron was 'flip-flopping' on the EU:

'David Cameron cannot be trusted. Just a month ago he attacked Sadiq Khan as a terrorist sympathiser, yet today he hailed him as a great politician as he stood next to him on a shared platform,' he said.

'Today he trumpeted the benefits of the European Arrest Warrant but a few years ago he warned that it was dangerous and that it stripped away centuries old rights from the British people.

'David Cameron's flip flops show that he is not a man of principle - he is just desperate to cling on to power. He is only interested in saving his career not in what is best for the British people. People should not trust David Cameron.'

Vote Leave offered its own five-point picture of what Remain would look like, including sending further money to Brussels, facing greater immigration into the UK and being subject to regulation it said costs British companies £600m a week.

Mr Cameron happily posed for photographs with Remain campaigners at the event in south west London today

Journalists were not invited to the rally in Roehampton, meaning there were no awkward media questions for the Prime Minister or Mayor

It also said Britain would be unable to remove criminals and terrorists from the UK due to EU human rights laws, and would have to pay £43bn in tax refunds to multinationals.

Vote Leave chief executive Matthew Elliott said: “If people vote to stay, they are voting for the free movement of people from Europe to the UK, permanently.

"This will get worse when Albania, Macedonia, Montenegro, Serbia and Turkey join the EU.

“If we Vote Leave on 23 June, we take back control of our money, our borders and our democracy. That’s the safer option for our future.”

Veteran Eurosceptic Sir Bill Cash spoke out on the issue of Mr Cameron's future after Ms Dorries accused the PM of 'lying' and revealed she had sent a letter to the powerful 1922 committee demanding a formal vote of no confidence.

Fellow backbencher Andrew Bridgen has also raised the prospect of Mr Cameron going even if he wins the referendum, and suggested there could be a snap general election this Autumn.

Mr Khan said he would work with the Conservative government in the best interests of Londoners

The Prime Minister and Mr Khan said the issue of the EU referendum was more important than their other political differences

'My view is that they've been engaged in monumentally misleading propaganda. … They have relentlessly and fragrantly been anything but impartial and inaccurate,' Sir Bill told the Telegraph.

'Basically I think that they have got a very, very short time in which to correct all this. In my 30 year I've never seen anything on this including during Sir John Major's time.'

'I am certainly considering it. It is up to them. My powerful warning to them is get your act together, make sure that you put voters first and the country first.'