Keir Starmer has resigned as Labour's shadow home office minister, saying the "Brexit has changed the challenge ahead".
The former Director of Public Prosecutions said he had made the decision with "sadness and regret".
With sadness & regret, I have resigned as shadow home office minister: Brexit has changed the challenge ahead. https://t.co/l9NWXCh9zN
Mr Starmer is the latest of a number of shadow ministers to have resigned from their roles in the past 24 hours in protest of Jeremy Corbyn's leadership of the Labour Party.
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'.