The UK's Justice Secretary has said there are "significant downsides" to leaving the European Union without a deal.
David Gauke's comments come as the frontrunner to become the next British Prime Minister, Boris Johnson, insisted that he was not "bluffing" over his commitment to leave the EU by the end of October - with or without a deal.
Mr Johnson said he believes that even with a no-deal scenario, the UK will continue to prosper.
His rival for leadership of the Conservative Party, Jeremy Hunt, has also said a no-deal situation is possible.
Speaking on the BBC's Andrew Marr programme, Mr Gauke said he does not believe all of his colleagues have been as candid about the realities of a no-deal scenario as they could have been.
He said an open political debate is needed about the fact that all choices in relation to Brexit have significant consequences.
"I think there are very significant downsides for the UK if we leave without a deal. I think there's a lot of talk about preparing for no-deal, and one of the things we need to do is prepare the British people for the realities of no-deal, and I don't think all of my colleagues have been as candid about that as perhaps they might have been."
Mr Gauke also said he believes Parliament will find a way to prevent the new Prime Minister from Britain leaving the EU without a deal.
He said that if Mr Johnson becomes Prime Minister, he himself would not support a no-deal Brexit policy, and would resign.
"If Boris's position is that he is going to require every member of the Cabinet to sign up to be prepared to leave without a deal on the 31st of October, I can't support that policy. I would resign in advance."
