Margaret Hodge has told ITV News that Jeremy Corbyn's support for Britain to remain a part of the European Union was "half-hearted" as she called on him to step down.
He has "failed" in his leadership, the Barking & Dagenham MP said.
Speaking after tabling a motion of no confidence in the Labour leader, she said the party's voters had been muddled by Labour's message during the campaign.
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'.