Jeremy Corbyn is threatening to table a vote of no confidence in the prime minister unless she gets a date for the vote on her Brexit deal.
A Labour source indicated the motion would be targeted at Theresa May personally, rather than the government.
The move would be symbolic and would not force a change in government.
He is due to say: ‘If the prime minister does not announce the date for the final vote immediately and with the vote taken promptly, I will table a motion; that this house has no confidence in the Prime Minister due to her failure to allow the House of Commons to have a meaningful vote straight away on the withdrawal agreement and framework for the future relationship between the UK and the EU.’
Labour MP Owen Smith, however, tweeted: ‘Can’t see that there’s much point in a vote of no confidence in the PM – and not the government (are we saying we have got faith in Grayling, Hunt and the rest of them?).
‘Government will simply ignore it – they can’t ignore a motion of no confidence in the government.’