Any Brexit deal should be put to a second referendum, Luxembourg's prime minister has suggested.
Xavier Bettel said he hoped the House of Commons could "think twice" about leaving the European Union, or the decision could be put to a second public vote.
He said some of the promises made by the Leave campaign in the 2016 referendum were "lies" and voters should be given the chance to decide on the reality of life outside the EU.
"The fact is that the divorce was triggered by Theresa May last week, the procedure is going on, so it's a two-year procedure, maybe during this procedure you can still have strong feelings on Europe and maybe you decide in the House of Commons you think twice, again, before leaving your family," Bettel said.
Bettel also raised Scotland's demand for independence as a sign of the difficulties that the UK government was facing.
"For the moment I'm looking how you will stay still the United Kingdom," he said.
"So it is important for me that there will be discussions, and that in fact at the end maybe the deal that the UK got should be on the vote and a discussion to see if this is really what they want or not because it's a lose-lose situation."
"When the bill is there with all the things you might lose" politicians may be "courageous" enough to ask the public "do you accept this deal or not".
"This would be another possibility," he said. "And I insist on that point, some promises have been said by the Leave camp which are lies.
"This is very, very, very difficult to accept for some people who trusted those people."
Meanwhile, German deputy finance minister Jens Spahn said suggestions the Brexit divorce fee could be as high as AGBP60 billion ($A99 billion) were "not completely" unreasonable - although he acknowledged the initial demand was likely to be the starting point for negotiations.
