Sir Keir Starmer took aim at Rishi Sunak as he brands him "weak" for not sacking Liz Truss while "working people are paying the price".
The Labour leader said that if Sunak was "serious about the future" then he would ensure Truss is not a candidate at the next election.
GB News' political editor, Christopher Hope said: "Your opponent, the Prime Minister, said on Monday that you're someone who backed Jeremy Corbyn in 2019, a left-wing politician.
"Now you're backing Natalie Elphicke, a right-wing politician. What do you stand for?"
Sir Keir Starmer took aim at Rishi Sunak as he brands him "weak" for not sacking Liz Truss while "working people are paying the price"
PA/ GB News
In response, Starmer said: "Well, I would gently remind the Prime Minister that Jeremy Corbyn will not stand as a Labour candidate at the next election. This is a changed Labour Party.
"He [Sunak] is not able to say the same about his predecessor who smashed the economy and working people are paying the price.
"If he was serious about the future, he would ensure Liz Truss wasn't a candidate at the next election.
"But he's too weak to do that, so I've led from the front. I've changed my party - this is a party back in the service of working people.
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"What we are now seeking, humbly seeking, is the opportunity to change the country and put the country back in the service of working people."
The former Labour leader has had the party whip suspended since 2020 over his response to a report into antisemitism.
He was effectively banned from standing for Labour after the party's ruling National Executive Committee (NEC) backed a motion to prevent him from being endorsed for the seat.
Sunak has previously defended his economic record after being challenged onTruss' decisions.
Sunak has previously defended his economic record after being challenged onTruss' decisions
PALast month, the Prime Minister said he told Truss her economic policies were "wrong".
The ex-Tory leader - who became the UK's shortest-serving prime minister - launched her mini-Budget in September last year which triggered economic turmoil.
During PMQs in April, Sunak said: "Everyone knows that two years ago I wasn't afraid to repeatedly warn about what her economic policies would lead to, even if it wasn't what people wanted to hear at the time.
"I was right then but I am also right now when I say that his [Starmer's] economic policies would be a disaster for Britain."
