UK PM Boris Johnson and French President Emmanuel Macron are set to meet in Paris, hours after Mr. Macron insisted reopening negotiations is “not an option”.
Earlier on Thursday, the French leader called the situation in the UK an “internal democratic crisis”, which the EU “mustn’t be hostage to…nor export”.
German Chancellor Angela Merkel said on Wednesday that the onus was on Britain to find a workable plan.
However, Mr. Johnson has said a deal could be achieved with “sufficient patience”.
He has insisted that the backstop, which aims to prevent a hard border on the island of Ireland after Brexit, must be ditched if a no-deal departure from the EU is to be avoided.
If implemented, the backstop would see Northern Ireland staying aligned to some rules of the EU single market, in the absence of a trade deal.