Latest developments:
Heidi Alexander has spoken about her difficult decision to resign as shadow health secretary.
She told ITV's Peston on Sunday "the only decent and honourable thing to do was to resign" as she no longer had faith in Jeremy Corbyn's leadership.
The MP said she asked herself could she "hand on heart" say that she felt that "Jeremy was the best person to be leading the Labour Party in developing the answers the country is demanding".
"And I didn't feel I could so that," Ms Alexander added.
When asked if she had any sense of any other potential cabinet resignations amid mass speculation that up to half of Corbyn's top team could be about to quit, Ms Alexander said "there are a few people who feel similarly to me".
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'.