The work and pension minister Liz Kendall will cut Labor’s $5 billion disability benefits on Wednesday, claiming she is reforming the welfare state so that the welfare state will not be destroyed.

Opposition to welfare programs continues within her party ahead of next month’s vote. Labor seaters claimed that more than 100 colleagues signed a private letter telling the party that they could not support it.

In his speech to the Public Policy Institute, Kendall will argue for the need to limit the eligibility of certain benefits and insist that the cost of the system will be out of control without emergency intervention.

She would say: “Unless we make sure public funds are focused on the people who need it most and with the best opportunities to improve people’s lives, the welfare state simply won’t be with people who really need it in the future.”

"That's why we're trying to seize the nettle of welfare reform. Not for it, but for the preservation of it."

In recent years, the costs of welfare states have been widely stable, accounting for about 10% of GDP, but expenditure on disability benefits has risen sharply.

The layoffs were announced in the advance of Rachel Reeves' spring statement, as the Treasury savings were designed to ensure its independent forecaster (the Office of Budget Responsibility) could indicate that the Prime Minister is still working to meet her self-implemented fiscal rules.

Ruth Curtice, CEO of the Resolution Foundation IQ, acknowledged that changes are necessary as population ages and some parts of the welfare safety net.

But, she stressed: “Reform should consider the population as a whole – from low-income families to wealthy pensioners – and be driven by the goal of improving livelihoods, rather than rushing to achieve fiscal rules.”

Since the party’s disastrous performance in local elections, doubts about plans in labor MPs have been growing, with many blamed on the unpopularity of welfare cuts and the mean test of winter fuel allowances.

Some of these men who threaten to rebel against these changes are firm Keir Starmer loyalists. Members of Congress have 100 backseaters said they signed the letter, which is roughly different from the public statement signed by 42, which said the package is "unable to support".

The government's own impact assessment shows that cuts in individual independent payments (PIPs) and health factors in general credit will result in an average annual benefit of £1,720 for 3.2 million households.

Analysis of the Disability Poverty Campaign Group scattered among the Workforce Congressmen shows that more than 200 of them are smaller than the number of PIP claimants in their constituencies.

Kendall is eager to focus more on the £12.8 billion spending on the re-measures, which forms another part of the packaging she fought for in negotiations with the Treasury.

She would argue that Labour’s goal is to “give people real hope. To give people a better future. To create jobs and opportunities, and to decent public service, people need to build better lives.”

However, labor market experts warn that the increase in employment due to the impact of layoffs could dwarf people.

"Employment support will put a large number of people into the job, which will save taxpayers money, so it's a good thing, it's a good thing, it's a big thing: it's almost twice the amount it's spending now, but it doesn't actually make a difference. It makes the benefit of 32,000 people."

ThinkTank estimates that between 45,000 and 95,000 people may find jobs due to additional spending - but it's hard to predict given the government hasn't yet proposed how to allocate funds.

Meanwhile, a basic analysis of the data released by Kendall's department shows that the team that cuts PIP in particular may be people over 50 and those with musculoskeletal disorders, including back pain and arthritis.

These groups are more likely to score less than four points on the qualification test in PIP's daily life, which is the new threshold under the change. For example, almost 80% of back pain claimants, 77% of arthritis and 68% of chronic pain syndrome did not score four points in any category.