Jeremy Corbyn's plan to force all Labour MPs to enter a ballot in order to contest their seat in the General Election is expected to be blocked after union sources reportedly refused to back it.

The Labour leader is understood to want every MP to be forced to secure more than half of their local party's votes in a so-called trigger ballot before being allowed to stand again.

But it is understood that the National Executive Committee will block the plan at an emergency meeting on Wednesday morning, allowing MPs to automatically stand again without a ballot if they want to.

It came as Mr Corbyn refused to confirm he will stand down as party leader if Labour suffers defeat in the General Election as two of his MPs stood down ahead of the vote.