As she answered an urgent question on the recent flooding in England on 25 June 2012, she dismissed accusations from her shadow counterpart that the cuts would amount to 30%.
Shadow Chancellor Alan Johnson has denounced spending cuts plans as a "reckless gamble with people's livelihoods".
In a Labour-led debate on 30 November 2010, shadow education secretary Andy Burnham said the cuts, which made him "want to weep", flew in the face of government aims to improve children's health.
Shadow work and pensions secretary Liam Byrne said cuts to tax credits had pushed millions of working families into poverty and now meant thousands of part-time workers were "better off on benefits".
Shadow Chancellor Ed Balls' attacks on government spending cuts have become "predictable" and "tiring to the public", Lord Mandelson has suggested.
For Labour, shadow Treasury minister Cathy Jamieson said the government's cuts showed ministers were "out of touch" with voters who were struggling to pay their energy bills.
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But shadow work and pensions secretary Liam Byrne claimed the bulk of the cuts would affect working households.
In a speech to the Fabian Society, shadow chancellor Ed Balls said he could not promise to reverse any cuts and said Labour faced "a big task" to regain economic credibility.
Well a few months ago they were saying there were going to be spending cuts and tax cuts now of course they've got all their shadow ministers promising to spend even more money.
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More than 20 Labour MPs - led by shadow home secretary Yvette Cooper - have called on the government to reverse planned police cuts.
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Mr Miliband's words came after former Labour Business Secretary Lord Mandelson criticised shadow chancellor Ed Balls for "predictable" attacks on the government's spending cuts.
As well as handing the letter to David Cameron, the group also met with shadow ministers including Hilary Benn, Shadow Secretary of State for Communities and Local Government, to discuss the effect of cuts on Liverpool.
Labour MP Margaret Curran, the shadow Scottish secretary, said the country was trapped between "a UK government that cuts tax credits for working families and a Scottish government that's prepared to launch another talking shop instead of a real plan to get people back to work now".
Later, shadow justice minister Lord Bach called for the preservation of free legal support for people challenging cuts to their benefits.
Peter Hain, the shadow Welsh Secretary, was "suspicious ... at a time when their savage cuts are hitting Wales so hard, we are sceptical about the impact any tinkering in the funding formula will have".
And on Monday, Shadow Chancellor George Osborne said it would be "ridiculous to pretend there won't be cuts" in public spending in the coming years.
After the next election, if not before, that will guarantee that there will be further steep tax increases or eye-watering spending cuts - a political choice the chancellor will want to highlight tomorrow in order to put his shadow, Ed Balls, on the spot to spell out what Labour would do.
Shadow defence secretary and Labour MP Jim Murphy said defence in Scotland faced a double danger from both UK government cuts and Scottish government plans for independence.
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Shadow Home Office minister Vernon Coaker told the BBC the government should be given the same sort of protection from spending cuts as the health and education sectors.
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