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Labour's deputy leader, Tom Watson, is expected to hold emergency talks with trade union leaders to try and get them to withdraw their support for Jeremy Corbyn.
In a bid to break Labour's deadlock - Jeremy Corbyn refuses to resign as leader, but many of the party's MPs do not support him - sources said union leaders had "reached out" to Mr Watson to see if they could find a negotiated settlement.
However, due to "logistical" difficulties, it was "proving tough" to arrange a meeting between Mr Watson and union chiefs, a source close to the MP for West Bromwich East said.
While Unite leader Len McCluskey said on Sunday that unions could act as "honest brokers" in the leadership saga, leaders of some of the other biggest unions affiliated to Labour have not commented, and some officials are reported to be on holiday.
ITV News' political correspondent, Carl Dinnen, reports.
As pressure on Jeremy Corbyn to resign increases, the Labour leader has released a video message to party supporters, urging them to "come together".
However, this is at the same time that Labour's deputy leader Tom Watson has said that on Tuesday he will speak to the unions to try and get them to withdraw their support for Mr Corbyn.
Former shadow cabinet member Anglea Eagle has also said she has "the support to run and resolve this impasse", and that she will do if Mr Corbyn "does not take action soon".
The leader of the Unite union has hit out at Labour grandees being "dragged out" to be part of the "unedifying" coup against Labour leader Jeremy Corbyn which he said was "outrageous".
In an interview on the BBC's Andrew Marr Show, Len McCluskey said: "This has been a political lynching of a decent man undermined, humiliated and attacked in order to push him out."
He added: "And here's the truth, it's failed. Jeremy Corbyn is made of stronger stuff. He is a man of steel."
Angela Eagle refused to comment on reports linking Owen Smith with a leadership challenge as she reiterated her call for Jeremy Corbyn to quit as Labour leader.
Ms Eagle has also been touted as candidate to replace Jeremy Corbyn, who is under immense pressure to step down following mass resignations from the Labour front bench.
"It's all about Jeremy considering his position and I don't think speculation about anything else is useful," she told ITV News.
She called on Jeremy Corbyn to do the "right thing for the party and the country" and resign.
"Let's face it the country is in a crisis and we need strong opposition.
Embattled Labour leader Jeremy Corbyn has attended a rally in Islington, north London.
As he addressed supporters in Highbury Field, some of which chanted "Jeremy in, Tories out", he said, "it means a lot that people come together at very, very short notice."
Despite the tumultuous events of the last week after a string of shadow cabinet resignations, Corbyn appeared to be in high spirits and even stopped to pose for a selfie with one supporter.
Latest ITV News reports
The leader of the UK's biggest trade union has said the country is 'riven' as a result of the EU referendum.
Len McCluskey told ITV News that the trade unions can help broker a peace deal and reunite the party now the "coup has failed".