Iain Duncan Smith attacks 'unfair' budget in first interview since resigning

David Cameron will hit back at claims made by ex-Cabinet minister Iain Duncan Smith that the government does little for poor Britons by claiming he is a champion for "modern, compassionate, conservatism," ITV News Political Editor Robert Peston understands.

Downing Street and Iain Duncan Smith have been have been locked in a series of acrimonious exchanges over the former work and pensions secretary's shock resignation.

ITV News political editor Robert Peston reports.

Downing Street has responded to the resignation of Work and Pensions Secretary Iain Duncan Smith saying they are delivering the welfare cap that was a key part of the Manifesto on which they were elected

The government pledged to stick by their plan to "deliver stability, security and opportunity for working people in our country."

Mr Duncan Smith issued a devastating attack on what he termed an "unfair" budget, accusing David Cameron and George Osborne of balancing the books on the backs of struggling working people and the vulnerable.

Iain Duncan Smith will give his first post-resignation interview as the row over why he quit his cabinet post continues to rumble on.

Fresh fallout is expected to follow the former Work and Pensions secretary's interview on BBC One's Andrew Marr show this morning as a growing split appears to be dividing the Tories following Duncan Smith's claims that he resigned over proposed disability benefit cuts.

Iain Duncan Smith's former colleague Baroness Altmann has slammed her old boss after he handed in his resignation over disability cuts, claiming he had in fact "championed the reforms he's resigning over".

In a series of tweets the pensions minister also stated that she had been "shocked" by the reason given for Duncan Smith's resignation and suggested he had an ulterior motive for stepping down.

As the row rumbles on about who was responsible for proposed disability benefit cuts that have now been dropped, the question many are asking is how damaging will this situation be to the government?

According to ITV's Political Editor Robert Peston the situation could be very damaging, here he explains why:

Jeremy Corbyn has accused Iain Duncan Smith of "hiding his conscience" for six years, and urged his successor to U-turn on proposed cuts.

The Labour leader said former Work and Pensions Secretary Duncan Smith, who resigned last night, had presided over some "fairly appalling policies".

He added that the first task of Duncan Smith's replacement, Stephen Crabb, was to completely reinstate Personal Independence Payments.

Corbyn said his party would "hold the Government to account" over PIP, and described current availability to work tests as "appalling".