The frontrunner to become Sir Keir Starmer's Labour Party deputy has admitted that 'things aren't going well' under his leadership.
Lucy Powell, who was sacked as a minister by Sir Keir last month, hit out as voting opened in the race to become the party's deputy leader, saying his record should not be 'sugar-coated'.
The Manchester Central MP has been backed by figures including Lord Neil Kinnock and others who want the Prime Minister to tack left to restore Labour's electoral support.
However, her attack was met with a furious riposte by her challenger, Bridget Phillipson.
The Education Secretary warned that voting for her rival risks 'energising our opponents', as they seek to replace Angela Rayner.
In a video posted on X, Ms Phillipson said: 'Make no mistake, change is on the ballot, but it's the kind of change that you get to choose - whether it's me at the Cabinet table pushing for more of the brilliant Labour things that you all want to see, or the risk that comes of disunity, of shouting from the sidelines and energising our opponents.
'With a seat at the Cabinet table, I'll put Labour's heart and soul into Government, and I'll make sure that I deliver for working people, unite our party and secure that second-term Labour Government that we all want to see.'
Lucy Powell, who was sacked as a minister by Sir Keir last month, hit out as voting opened in the race to become the party's deputy leader, saying his record should not be 'sugar-coated'.
However, her attack was met with a riposte by her challenger, Bridget Phillipson, who said voting for her rival risks 'energising our opponents'
Ms Phillipson has the backing of unions including GMB and Unison, as well as former home secretary Alan Johnson, while Ms Powell has the support of Lord Kinnock - who led the party from 1983 to 1992.
Ms Powell, speaking at a rally with members in east London on Tuesday, said the party needs to start telling 'a stronger story about the purpose of the Labour Government'.
She said: 'I'm proud of Labour's achievements, but we need to acknowledge that mistakes have been made.'
'We can't sugarcoat the fact that things aren't going well. We have ceded the political megaphone to our opponents instead of setting the agenda ourselves. I want to help Labour wrest it back.'
Ms Powell said Labour is in the 'fight of our lives' and needs to start listening to broader voices or risk 'group-think' setting in.
She added: 'Politics has become more fractured and divided; we're losing support to both sides. Trying to 'out-Reform' Reform doesn't work.'
Ms Phillipson, writing in The Mirror, said it was important for the party to stay united and not 'turn in on ourselves at this crucial moment' which would be welcomed by Nigel Farage, leader of Reform UK.
She also pledged to make reducing child poverty the 'moral mission' of the Government, guaranteeing it would fall in this Parliament.
She said: 'Like Angela Rayner and John Prescott, I'm going to give members a voice from the Cabinet table, not throw rocks from the outside.'
'As deputy leader I want to unite our party, deliver change for working people and beat Reform - and deliver the second Labour term our children deserve.'