Tessa Jowell has issued a direct plea to Jeremy Corbyn to stand down.
The former culture secretary told ITV's Good Morning Britain that the Labour leader was putting the party's future in jeopardy.
Baroness Jowell described the leadership crisis as a "complete shambles" and said it was a "statement of the obvious" that Mr Corbyn must stand down.
Speaking down the camera directly to Mr Corbyn she said: "Jeremy, you love the Labour Party like I do and the Labour Party has given you every opportunity that you have been able to exercise to make life for your constituents better.
"You and I are in the same position in relation to that but it is absolutely clear that your continued leadership is putting the Labour Party's future in jeopardy and denying millions of people in our country who so desperately need representation by a Labour government the chance of that Labour government.
"So I ask you to follow the strongest possible view of the parliamentary party and stand down."
Asked what is going on in her party, she said: "It is a complete shambles and it is a statement of the obvious that Jeremy has got to stand down and allow a new leader to rebuild the party."
She said the notion of a Labour government in the future seemed "a rather distant prospect" and called the current situation the "worst crisis" in her 45 years as a member of the party.
The ex-Cabinet minister also said it was not clear whether Mr Corbyn would be automatically on the ballot of any leadership election because of doubt over whether he has the support of enough MPs.
Pushed to offer names of potential leadership candidates, she said MPs currently in the frame for the leadership were Tom Watson, Angela Eagle and Yvette Cooper.
Why are you making commenting on The Herald only available to subscribers?
It should have been a safe space for informed debate, somewhere for readers to discuss issues around the biggest stories of the day, but all too often the below the line comments on most websites have become bogged down by off-topic discussions and abuse.
heraldscotland.com is tackling this problem by allowing only subscribers to comment.
We are doing this to improve the experience for our loyal readers and we believe it will reduce the ability of trolls and troublemakers, who occasionally find their way onto our site, to abuse our journalists and readers. We also hope it will help the comments section fulfil its promise as a part of Scotland's conversation with itself.
We are lucky at The Herald. We are read by an informed, educated readership who can add their knowledge and insights to our stories.
That is invaluable.
We are making the subscriber-only change to support our valued readers, who tell us they don't want the site cluttered up with irrelevant comments, untruths and abuse.
In the past, the journalist’s job was to collect and distribute information to the audience. Technology means that readers can shape a discussion. We look forward to hearing from you on heraldscotland.com
Comments & Moderation
Readers’ comments: You are personally liable for the content of any comments you upload to this website, so please act responsibly. We do not pre-moderate or monitor readers’ comments appearing on our websites, but we do post-moderate in response to complaints we receive or otherwise when a potential problem comes to our attention. You can make a complaint by using the ‘report this post’ link . We may then apply our discretion under the user terms to amend or delete comments.
Post moderation is undertaken full-time 9am-6pm on weekdays, and on a part-time basis outwith those hours.
Read the rules here