Latest developments:
Union members on Labour's National Executive are set to call for unity and confirm their support Jeremy Corbyn's leadership, sources said.
A statement is expected later amid union anger at the moves by members of the shadow cabinet against the Labour leader.
Jennie Formby, one of Unite's representatives on the National Executive Committee (NEC) said it was "nonsense " to blame Mr Corbyn for the referendum result and said Labour MPs should show unity.
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'.