European Union chief Brexit negotiator Michel Barnier attends the weekly EU College of Commissioners meeting at EU headquarters in Brussels, Wednesday, Oct. 16, 2019.
Irish Prime Minister Leo Varadkar said on Wednesday there are still issues to be resolved in negotiations.
"I am optimistic that it is still possible we could reach a tolerable deal and I will be voting for it", he said.
He also said Prime Minister Boris Johnson would meet the undertakings given to a Scottish court earlier this month, when the government's top legal officer in Scotland gave assurances the government would fully comply with a law which requires Johnson to request a delay to Brexit if no deal is reached by October 19.
Talks are now underway on a mix of Theresa May's proposals and Boris Johnson's mooted customs arrangement, which, in its initial version, would see Northern Ireland partially tied to the EU's customs union following Brexit, with customs checks carried out away from the border to avoid the necessity of physical facilities between Northern Ireland and the Republic of Ireland.
Others who have indicated they could now be prepared to vote for a deal with the right reassurances on Northern Ireland, workers' rights and environmental protections include Stephen Kinnock, Gareth Snell and Ruth Smeeth. Negotiating teams were working into the night at European Union headquarters to solve them.
But both sides say gaps remain over plans for keeping goods and people flowing freely across the Irish border, the thorniest issue in the talks.
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But if an agreement is not ready for the Brussels summit, Johnson will nearly certainly have to postpone Britain's exit again - for what would be the third time since the country voted in a referendum in June 2016 to quit the EU.
It is likely to become clear within the next few days whether it will be possible for a deal to be done at Thursday's European summit and it could drag on until next week. But Northern Ireland's DUP, the party that props up Johnson's minority Conservative government, strongly opposes any measures that could loosen the bonds between Northern Ireland and the rest of the United Kingdom.
Brexit is expected to be the central theme of the EU Summit which begins on Thursday, just two weeks ahead of the UK's scheduled departure from the bloc.
Pro-Brexit Conservative British lawmaker David Davis said success in passing a Brexit deal rests on the stance of the DUP.
DUP leader Arlene Foster quickly moved to reject a suggestion that her party had accepted the latest proposal on consent. "Discussions continue. Needs to be a sensible deal which unionists and nationalists can support".
Lawless reported from London.