Jeremy Corbyn is set to launch a fresh bid to break the Brexit deadlock as she heads to Brussels for talks with EU leaders.
The Labour leader said he would use meetings with EU chief negotiator Michel Barnier and European Parliament Brexit coordinator Guy Verhofstadt to stress that a no-deal option does not command a majority in Parliament.
Ahead of Thursday's crunch talks, Mr Corbyn called on Theresa May to abandon her “red lines” to secure a workable deal after hers was defeated when MPs voted it down last month.
He accused the government of trying to “blackmail” MPs by running down the clock so they are forced to accept the Prime Minister’s agreement over a “chaotic” no deal.
Mr Corbyn added: "We are saying loud and clear that there is no majority for no deal, and Labour will be working with politicians across the House to prevent a no-deal outcome which would be so damaging to our economy and communities.
"Labour respects the result of the referendum, but we do not support the Prime Minister's damaging approach which is focused more on appeasing factions of her party than finding a sensible solution that works for the whole country.
"With just 37 days until Brexit, Theresa May must accept that her historic defeats in Parliament and complete failure to reach a new deal mean her approach has failed.
"She should abandon her damaging red lines and finally work with Labour to reach a deal which works for our country."
As well as Mr Barnier and Mr Verhofstadt, the Labour leader will meet European Commission secretary general Martin Selmayr. He will be accompanied on the trip by shadow Brexit secretary Sir Keir Starmer.
The talks come after Mrs May and European Commission president Jean-Claude Juncker hailed "constructive" talks despite no breakthrough in Brussels on Wednesday.
In a joint statement, Mrs May and Mr Juncker said their teams would press on to “explore the options in a positive spirit”.
The Prime Minister travelled to Brussels to seek legal assurances on the Northern Ireland Brexit backstop she believes are needed to secure Parliamentary approval for her Withdrawal Deal.
Read More
The pair plan to meet again before the end of February, when Mrs May faces a new test in Parliament where her minority government just lost three MPs.
With 37 days to go to a potential chaotic Brexit, officials were "seized of the tight timescale and the historic significance of setting the EU and the UK on a path to a deep and unique future partnership", the statement said.
Mrs May said afterwards progress had been made over the backstop but added time was running out to secure changes.
MORE ABOUT