Lord Andrew Adonis has branded Theresa May the "worst Prime Minister in living memory" during an interview with Julia Hartley-Brewer on the breakfast show.
During the interview, broadcast live from the Labour party conference in Liverpool, the Labour peer said: "Theresa May is the worst Prime Minister in living memory. I certainly agree on that with Mr Farage.
"The people conducting the negotiations are the government, they're not us. The people that started talking about no-deal were the government. It was the government that published a whole lot of papers.
"What we'll say to our voters is it's not our fault that this is happening. We're having to respond in real-time to a crisis which the government has created."
'I don't agree with Keir'
Lord Adonis also revealed he disagreed with Keir Starmer's stance on having a people's vote as an option if the Chequers plan fails, calling his policy "weak" and "pathetic".
"Can I let you into a secret? I don't agree with Keir, because the policy that he set out yesterday is that in the event of Theresa May's deal collapsing in Parliament, one option on the table would be a people's vote.
"To my mind that's a weak and pathetic position. The right positition for the Labour party, because it's the right position for the country, is that in the event of Parliament not wanting her deal - because it trashes the economy and trashes people's jobs - the right thing then is to go immediately to a people's vote. To have this big faffing around which could last for months, we could be in this zombie period...
"I think we should move to a people's vote immediately after any deal is rejected. So at the moment there's no agreement amongst any of us."