The line up of candidates vying to become the leader of the Labour Party will be finalised at midday, when the deadline for nominations passes.
Currently, shadow health secretary Andy Burnham, shadow home secretary Yvette Cooper and shadow health minister Liz Kendall, are all in the race, each having received at least 35 nominations from other Labour MPs.
However, dozens of the party's 232 current MPs are yet to declare their support, and left-winger Jeremy Corbyn, who is currently 13 short, might yet force his way into contention.
Once nominations are over, candidates will take part in a series of debates in marginal seats Labour failed to win this year all around the country. The eventual winner will then be voted on by members of the Labour Party as a whole, and announced on 12 September.
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David Miliband has launched a scathing critique on Labour under his brother Ed's leadership calling it "backward-looking" and "out of touch".
Mr Miliband, who moved to New York in 2010 after losing the Labour leadership contest to his brother, gave two separate interviews following his younger sibling's defeat last month.
Asked in a video interview with CNN how Labour could recover, he said: "The public have concluded that instead of building on the strengths and remedying the weaknesses of the Blair years the party has turned the page backwards rather than turning the page forward.
"So I think it is the responsibility of all the candidates to find again that combination of economic dynamism and social justice that defined the success of the Labour Party in the 1990s and early 2000s."
Speaking separately to The Times (£), Mr Miliband, who runs the International Rescue Committee charity, said the defeat was "doubly painful" because of his brother's involvement and he did not want him to be "hurt or vilified."
I have to say that any sense of vindication is massively outweighed by a sense of frustration and anger about what’s going to happen to the country.
However, he also added that he "was not wrong" to believe that "you couldn’t suspend the laws of political gravity."
Labour's acting leader Harriet Harman has admitted a significant number of supporters were relieved when the party lost the election.
She cast doubts over Ed Miliband's economic credibility with the public and said the party had taken the "wrong message" to voters.
"The two combined together. People tend to like a leader they feel is economically competent," she told The Independent.
Many voters felt the party was failing to reach out to them because it raised issues such as zero-hours contracts, the living wage and food banks, she added.
Labour leadership candidate Liz Kendall has said the policy of removing tax credits from migrant workers is "definitely something we should look at".
Kendall told the BBC's Andrew Marr Show: "We do have to deal with the issue of people who come here to work.
"They must be working and not claiming benefits. But this is about something much bigger - it is about the future of our country and our place in the world.
"David Cameron should be focusing on what is in Britain's national interest and our place in the world, not on internal party politics."
Lord Mandelson has blasted Labour for failing to have a strategy to decentralise power from London to northern England.
The former business secretary accused his party of having "language, not policies" on the issue and described the lack of an alternative to Chancellor George Osborne's "Northern Powerhouse" a "huge political mistake".
Peter Mandelson told the BBC's Sunday Politics North West programme, "We were not radical enough in what we were proposing to decentralise and to devolve away from London and to the regions."
Lord Mandelson said of Osborne, "He got an idea, whatever his motive was, and he is running with it and we let him do so and that was a huge political mistake.
Labour should run its own "distinctive" Yes campaign for the UK to remain in the European Union, leadership hopeful Andy Burnham has said.
Mr Burnham said Labour had to learn lessons from the Scottish independence referendum campaign. Critics argue the party lost votes in Scotland because of former leader Ed Miliband's decision to campaign for a No vote with the Conservatives.
The shadow health secretary promised that Labour would run its own Yes campaign, focusing on issues such as preventing workers being "undercut" by EU immigrants, exclusive recruitment from overseas and strengthening enforcement of the national minimum wage.
He is travelling to Brussels for talks with MEPs and the UK's ambassador to the EU on Wednesday.
"Even though Labour is in a leadership campaign, I am not going to let the EU debate be defined by David Cameron."
Labour leadership candidate Yvette Cooper has accused her party colleagues of "swallowing the Tory manifesto" since the party's general election defeat.
"I will set out ideas for the future that don't just involve swallowing the Tory manifesto and set out a Labour vision for the future," she told BBC1's The Andrew Marr Show
The comments were quickly perceived as an attack on her leadership rival Liz Kendall but when asked if she was referring to the shadow care minister, Ms Cooper said she did not want to attack specific individuals.
The shadow home secretary also appeared to criticise another leadership candidate Andy Burnham, who said that Labour had appeared "soft" on benefits claimants.
Ms Cooper said it was wrong to "stigmatise" people who were out of work, adding that it was against Labour values.