Liberal Democrat Danny Alexander has accused the Conservatives of being bent on "slashing support for families" while the two parties were in coalition.
Alexander said £8 billion of proposed welfare cuts that the Lib Dems blocked included limiting Child Benefit and Child Tax Credit to two children at a cost of £3,500 for a family of three.
The Tories said they did not recognise the figures cited and called the claim "desperate stuff".
The policy document at the centre of Danny Alexander's leak of "secret" Tory welfare cuts was commissioned by Alexander and was not backed by the Conservative party, George Osborne has claimed
The Chancellor hit back after the Lib Dem Chief Secretary leaked what he claims were Tory proposals to cut child benefits by £8 billion.
Speaking on BBC London, Mr Osborne added that Labour "wants to put up the benefits bill and that means higher taxes for working people."
He said that the Conservative party would cut taxes for working people "and we think savings can be made in the welfare system."
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.