Dozens have thrown their support behind a letter urging the government to “delay” the proposals, which they blasted as “the biggest attack on the welfare state” since Tory austerity.

The MPs - who are restless after Labour’s poor showing at last week’s local elections - warned the prime minister that his plans to slash the welfare bill by £5bn a year were “impossible to support” without a “change in direction”.

In the letter, seen by Sky News, the MPs said the reforms - which will tighten eligibility criteria for incapacity benefits - had caused a “huge amount of anxiety among disabled people and their families”.

“The planned cuts of more than £7bn represent the biggest attack on the welfare state since George Osborne ushered in the years of austerity and over three million of our poorest and most disadvantaged will be affected,” they wrote.
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A government impact assessment in March found an additional 250,000 people - including 50,000 children - could be pushed into relative poverty in the financial year ending 2030.

The MPs went on to say that while the benefits system needed reform, this needed to be done “with a genuine dialogue with disabled people’s organisations”.

“We also need to invest in creating job opportunities and ensure the law is robust enough to provide employment protections against discrimination,” they added.

“Without a change in direction, the green paper will be impossible to support.”