Latest developments:
Shadow chancellor John McDonnell has said Labour leader Jeremy Corbyn is likely to face a leadership challenge in "the next few days" but he will survive it.
Mr McDonnell appealed to the party's MPs to "calm down" and settle Labour's differences through a democratic process.
Answering questions following a speech in London he said Mr Corbyn is "staying as the leader of the Labour Party" and if there was a contest he could win.
He added that it was "really disappointing" that frontbenchers had quit at a time when the country needed stability.
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".
Labour leader Jeremy Corbyn said he would 'reach out' to MPs that oppose his leadership but said they should 'respect democracy'.