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.
Iain Duncan Smith tells ITV News' Robert Peston his resignation was intended to push the government into pursuing a fairer welfare policy.
Former Work and Pensions Security accuses government of making 'arbitrary cuts' which he says damages the party and the country.
Conservatives fractures show with claim and counter-claim by ministers from within the DWP about the conduct of Iain Duncan Smith.