British Foreign Secretary Jeremy Hunt has said Brexit might not happen if Theresa May's deal is voted down by the British parliament next week.
Mr Hunt said that if Mrs May's deal was defeated then there was a real chance of "Brexit paralysis" that could lead to Britain's planned exit being stopped.
He said the British parliament was committed to stopping a no-deal Brexit.
Speaking on BBC radio, Mr Hunt said: "If this deal is rejected, ultimately what we may end up with is not a different type of Brexit but Brexit paralysis.
"And Brexit paralysis ultimately could lead to no Brexit.
"I'm saying this would be an incredibly damaging breach of trust and it would also be very bad for Britain's reputation abroad, having decided to leave the EU, if we in the end for whatever reasons found we weren't able to do it."
Mr Hunt warned: "If we were, as a political class, not to deliver Brexit, that would be a fundamental breach of trust between the people and the politicians.
"I think that is something that we would regret for many, many generations."
Mr Hunt acknowledged that Mrs May's deal was "not perfect" but insisted it "broadly delivers Brexit".
He said that, after months of MPs seeking their "number one favourite outcome", it was time for them to come together behind a deal which would ensure that Brexit happens.
Warning there may well be no consensus in Parliament behind any outcome, Mr Hunt said: "What is important is for MPs on all sides, Brexiters and Remainers, whatever our disagreements, to say 'We are democrats and the most important thing now is to make sure that we really do deliver Brexit'."
Mr Hunt said that parliament speaker John Bercow had shown that he was "willing to frustrate the British government at every opportunity", and it was not possible for the minority Tory administration to control what happened in Parliament.
"I think it's now looking much less likely that Parliament would allow a no-deal outcome anyway," he said.
"We have seen from this week that Parliament has the ability to assert itself and to shape outcomes.
"I think Parliament is very committed to try to stop no-deal, but I think we have to recognise that there is a deal on the table, it does broadly deliver the Brexit people voted for, and if we don't find a way to get this through, we are taking some very big risks.
"Brexit paralysis potentially leading to no Brexit is something I think would be incredibly damaging for the long-term future of this country."