Ed Balls has told Peston on Sunday that Angela Eagle's leadership bid is "essential" as Jeremy Corbyn "can't do the job".
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The former shadow chancellor said no one believed Corbyn could ever become prime minister.
"Frankly there is no message at all coming from Labour in the last two weeks about what the solutions to these big problems are," he told Robert Peston.
"There's got to be a change. It's not just necessary for Labour, I think it's necessary for the whole country.
"We need a strong opposition which believes it can form the next government and I'm afraid nobody thinks Jeremy Corbyn is going to be the prime minister of our country."
The shadow chancellor earned loud cheers as he launched an foul-mouthed attack on the MPs seeking to replace his friend Corbyn.
The MP for Pontypridd resigned as shadow work and pensions secretary last month in protest at Jeremy Corbyn's leadership.
I now realise that my earlier description of the NEC meeting - as an omni-shambles - was generous.