Cameron will say that the Leave campaign must reveal their plans for Britain outside of the EU, or be guilty of “perpetuating an economic con-trick” on Britain, and accuse the Brexiteers of being “reckless” and “undemocratic”.
He will launch the attack alongside Labour's Harriet Harman, as well as Lib Dem leader Tim Farron and Greens leader Natalie Bennett.
They will tomorrow say that Leave campaigners are asking voters to make decisions without putting forward detailed proposals, and that the failure to lay out plans means that the livelihoods of working people are at stake.
Speaking at an event in London today, the quartet will say: “The British public deserve better than being asked to roll the dice.”
Vote Leave chief executive Matthew Elliott called the attack “desperate” and accused Cameron of resorting to “petty personal attacks”.
“People are rejecting their pessimistic campaign of doom in favour of our positive vision for Britain’s future,” Elliott said.
"We have set out a series of pledges about how life will be better if we take back control. We want to invest more in the NHS, create 300,000 jobs through new trade deals, cut energy bills for families and introduce a new Australian style points-based immigration system.”
It comes after Labour leader Jeremy Corbyn snubbed his predecessors' bid to offer a joint message urging the party's backers to vote.
The letter, published this week, is a plea from former Labour leaders Neil Kinnock, Margaret Beckett, Tony Blair, Gordon Brown, Harman and Ed Miliband to encourage participation, and says that Labour's values “are inherent to Europe's values”.
City A.M. understands that while Corbyn was invited to join his predecessors in signing the letter, he declined to do so.
Labour Leave general secretary Brendan Chilton said: "It's no surprise to see Jeremy's name missing. He is a life-long Eurosceptic. Time and time again, he has voted in parliament against giving further power to the undemocratic and pro-austerity political elite in Brussels."