The European Parliament will stand by Ireland and the need to safeguard the Good Friday agreement, the parliament's Brexit pointman Guy Verhofstadt said on Monday before meeting British Prime Minister Theresa May in Strasbourg.
If a deal can be struck Mrs May is likely to publish details late tonight alongside new legal advice from the attorney-general, Geoffrey Cox, ahead of tomorrow's meaningful vote.
It is understood this would be a legally binding interpretation of the Withdrawal Agreement, but it would not alter the text of the agreement.
With Britain due to leave the European Union on March 29, and no agreed direction for the world's fifth-largest economy to take, Prime Minister Theresa May will ask lawmakers to vote on up to three possible outcomes.
But the European Union has repeatedly said it does not want to reopen the divorce deal, officially known as the Withdrawal Agreement, and the British government's top lawyer has failed to find a legal fix.
Mrs May has so far given no indication which way she would vote or whether Tory MPs would be whipped to back the Government line.
Parliament rejected May's deal by 230 votes on January 15, prompting the British leader to return to Brussels in search of changes to address the so-called Irish backstop - an insurance policy created to prevent the return of a hard border between Ireland and Northern Ireland.
The EU and Britain have also agreed a joint statement to supplement the Political Declaration, Lidington said. Conservative lawmaker Steve Baker said ahead of Lidington's statement to parliament.
There has been speculation that the beleaguered prime minister may be forced to resign.
'She said she had been advised this letter would have legal force in worldwide law.
The first parliamentary vote on the divorce deal took place in January and resulted in May losing by an unprecedented 230-vote margin.
Michael Gove, who campaigned for Brexit in 2016, said if May loses Tuesday's vote, the government would effectively lose control of Brexit.
If the concessions are not deemed adequate, one plan being discussed in the ERG was whether to table an amendment to May's motion saying parliament's approval would be conditional on "alternative arrangements" being found to replace the Irish backstop.
Just 19 days before the United Kingdom is due to leave the European Union on March 29, May is scrambling - so far unsuccessfully - to secure last-minute changes to an European Union exit treaty before parliament votes on Tuesday on whether to approve the deal.
"But in theory yes she does not have to have a meaningful vote this week".
Ireland's deputy prime minister says United Kingdom leader Theresa May is set to hold last-minute talks with European Union leaders to try to save her foundering Brexit divorce deal.
On Tuesday, they will be asked if they support May's deal. May promised to secure the required changes and re-introduce the agreement in parliament.
Meanwhile, the prime minister's office refuted as "complete speculation" the media reports that the United Kingdom government could switch a meaningful Brexit vote in the Commons on Tuesday to an indicative one. But lawmakers from all parties, backed by warnings from businesses, have mobilized to stop a no deal Brexit to save the United Kingdom from higher costs of trade on the morning after March 29. She has already survived votes of no confidence by her own party and Parliament as a whole.