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Boris Johnson reportedly warned there could also be a Brexit "meltdown" in feedback made at a non-public dinner this week.
The overseas secretary additionally referred to the Treasury because the "heart of Remain", in accordance with a report by Buzzfeed.
In recorded feedback to the marketing campaign group Conservative Way Forward he additionally reportedly mentioned he was "increasingly admiring of Donald Trump".
Friends of Mr Johnson mentioned they had been disillusioned remarks made at a non-public occasion had been covertly recorded.
The overseas secretary was apparently talking to a group in a non-public room after an Institute of Directors reception on Wednesday night time.
As said by Buzzfeed, he stated that the prime minister was "going to go into a phase where we are much more combative with Brussels".
He reportedly added: "You've got to face the fact there may now be a meltdown. OK? I don't want anybody to panic during the meltdown. No panic. Pro bono publico, no bloody panic. It's going to be all right in the end."
Brexit shall be "irreversible" and can occur, Mr Johnson mentioned, however the "risk is that it will not be the one we want".
He was mentioned to have described issues over the border between Northern Ireland and the Irish Republic as "pure millennium bug stuff" and urged Chancellor Philip Hammond's division was "basically the heart of Remain".
Mr Johnson mentioned fears concerning the Irish border had been out of proportion, saying: "It's so small and there are so few companies that really use that border commonly, it is simply past perception that we're permitting the tail to wag the canine on this means.
"We're allowing the whole of our agenda to be dictated by this folly."
On the United States president, who's making ready for an historic summit with North Korea's chief Kim Jong-un, Mr Johnson reportedly mentioned: "I have become more and more convinced that there is method in his madness."
"Imagine Trump doing Brexit," he additionally mentioned.
"He'd go in bloody exhausting... There'd be all types of breakdowns, all types of chaos. everybody would suppose he'd gone mad. But truly you would possibly get someplace.
"It's a very, very good thought."
He mentioned he was "increasingly admiring" of Donald Trump.