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She also argued that claimant levels are rising to unsustainable levels, and figures released this Tuesday found the number of people on Pips had reached a record high of 3.7m.

He believes it would be a political error for Labour to avoid radical reforms – or the whole system could become unsustainable.

She called the current level of polarization unsustainable.

"There is a real risk our debt becomes unsustainable this Parliament, unless we make tough choices about what the state does. We can't keep on muddling through."

Musk's noisy opposition has rested, in part, on his warning that the growing US debt is becoming unsustainable.