Copeland MP Jamie Reed is calling on Jeremy Corbyn to hand in his resignation.
Several members of the shadow cabinet have resigned after Hilary Benn was sacked over the weekend.
Mr Reed says that Jeremy Corbyn has lost the confidence of the party and the Labour heartlands like West Cumbria.
The Labour MP for Copeland has described the 'damage' to his party as a result of the EU referendum as 'incalculable'.
Writing in the Daily Telegraph, Jamie Reed says his party's campaign to remain within the European Union 'had struggled to be heard'.
The truth is that the Labour leadership did not give this campaign the profile, resources or energy that it required.
The Labour leader Jeremy Corbyn has defended his contribution to the Remain campaign.
Speaking at an event today, Mr Corbyn said he had been amazed that more than 100,000 people had signed a petition calling for him to remain in the role.
Copeland MP Jamie Reed has announced his resignation from front bench politics.
Mr Reed made the announcement on Twitter just moments after Jeremy Corbyn was named the new Labour Party leader.
Jamie Reed, the Labour MP for Copeland, has strongly criticised Jeremy Corbyn, one of the challengers for the party's leadership contest:
The only 'establishment' Jeremy represents a threat to is the establishment called the Labour Party.
Copeland MP Jamie Reed has confirmed he won't be standing for leader of the Labour Party.Read the full story ›
The full results and percentages from Copeland, where Labour MP Jamie Reed held his seat, but was given a tough test by the Conservatives.Read the full story ›
Another review will be held into maternity services across Cumbria.
The news has caused concern among campaigners fighting to keep services at the West Cumberland Hospital.
Copeland MP Jamie Reed has told ITV Border it would be "fundamentally stupid" to remove maternity services from Whitehaven. Katie Hunter reports.
Businesses from across Cumbria will be heading down to Westminster to take part in the first Cumbria Day next month.
Businesses from across Cumbria will be heading down to Westminster to take part in the first Cumbria Day.Read the full story ›