"I would like to see it happenIng before Christmas, it could go beyond Christmas Day. There are political factors at play," Martin told a news conference on Tuesday.
"We are really in a crucial moment. We are giving it a final push," said the negotiator, Michel Barnier, as he arrived to update the bloc's 27 national envoys on Brexit.
"The Taoiseach and President Macron were both attendees at the EU Council meeting in Brussels last week. The Taoiseach is limiting his contacts this afternoon as a precaution while he is tested,"
"You're right, the real end deadline is New Year's Eve but I think both sides are very possessed of the need to get outcomes to these negotiations in the next number of days," he added.
Johnson said he was also looking forward to seeing Biden when Britain takes over the rotating presidency of the G7 next year and invited him to attend the UN's COP26 climate change summit.