Iain Duncan Smith has warned that the government risks dividing society, in his first interview since resigning as work and pensions secretary.
He attacked the "desperate search for savings" focused on benefit payments to people who "don't vote for us".
And he told the
BBC's Andrew Marr his "painful" decision was "not personal" against
Chancellor George Osborne.
Downing Street said it was sorry to see Iain Duncan Smith go but was determined to help "everyone in our society".
BBC political correspondent
Alan Soady said Mr
Duncan Smith's interview - which followed his resignation over cuts to disability benefits on Friday - was an "absolutely blistering attack".
He added: "This was not just about his objections to one change in disability benefit, he was questioning the fundamental principles underpinning the government."
'
Narrow attack'
Mr Duncan Smith told the BBC he had supported a consultation on the changes to
Personal Independence Payments but had come under "massive pressure" to deliver the savings ahead of last week's
Budget.
The way the cuts were presented in the Budget had been "deeply unfair", he said, because they were "juxtaposed" with tax cuts for the wealthy.
He criticised the "arbitrary" decision to lower the welfare cap after the general election and suggested the government was in danger
of losing "the balance of the generations", expressing his "deep concern" at a "very narrow attack on working-age benefits" while also protecting pensioner benefits
.
If the focus on the working-age benefit budget continued, he said, "it just looks like we see this as a pot of money, that it doesn't matter because they don't vote for us".
Mr Duncan Smith, who said he felt he had become "semi-detached" from government, said the
Conservatives had to return to being a party "that cares about even those who do not vote for us".
He said he cared "passionately" about "people who don't get the choices my children get" and "bringing people back in to an arena where we play daily but they do not".
Deteriorating relationship
He suggested the government was in "danger of drifting in a direction that divides society rather than unites it, and that, I think, is unfair".
In his interview, Mr Duncan Smith gave his version of a deteriorating relationship with the government, saying he had considered resigning last year and had "long-running" concerns about cuts imposed since May's general election.
He said the disability benefit cuts should have been part of a "much wider programme" - but after
Christmas "pressure began to grow" to rush a consultation so they could feature in Wednesday's Budget.
Asked why he had not spoken out when the measures were presented to cabinet, he said he "sat silently" as he "realised the full state of what was happening" with tax cuts featuring elsewhere in the Budget.
After thinking "long and hard", he said he agreed to write to MPs to reassure them over the disability cuts, saying "it's not what it sounds like in the Budget".
But he said he realised in the following two days "there was no way I would able to stop this process" and resigned on Friday evening.
'
Security and opportunity'
Mr Duncan Smith spoke of his "love" for the
Conservative Party and described claims he was trying to undermine
David Cameron as "nonsense", saying he had had a "robust" conversation with the PM after telling him of his resignation.
Asked whether Mr
Osborne would make a good prime minister, he added: "If he was to stand and if he was elected by the electorate, which is not just me it is everybody else, I would hope that he would."
A
Number 10 spokesman said: "
We are sorry to see Iain Duncan Smith go, but we are a 'one nation' government determined to continue helping everyone in our society have more security and opportunity, including the most disadvantaged.
"That means we will deliver our manifesto commitments to make the welfare system fairer, cut taxes and ensure we have a stable economy by controlling welfare spending and living within our means."
He said more people were in work under this government with fewer "trapped" on unemployment benefits.
Ministers divided
- published: 20 Mar 2016
- views: 0