"I don't want anybody to panic during the meltdown", he told the gathering at a private dinner. He'd go in bloody hard... Everyone would think he'd gone mad.
When quizzed about the U.S. president, Mr Johnson said he had grown to admire the Republican, joking that he would like him to lead Brexit talks. But actually you might get somewhere.
He said the final Breixt deal may violate "red line" which Brexiteers vowed not to back down on, which keeps the United Kingdom "locked in orbit around the EU" and in the customs union and single market.
Buzzfeed said Johnson was keynote speaker at Conservative Way Forward's summer reception in London, and a select group of 20 people had gone afterwards into a private room for dinner where the foreign secretary was "characteristically ebullient and loose-lipped" on the most pressing policy and political matters facing the United Kingdom government. "It's a very, very good thought".
'They don't want any disruption of the economy.
He also played down the divisions in the cabinet that the secret recording exposed as the "spills and thrills" of the Brexit negotiations.
He also revealed that May intends to use this weekend's G7 meeting in Canada to propose a "rapid response unit to identify Russian malfeasance. whether it's cyber warfare, assassinations, calling it out and identifying it".
But Hammond has countered this suggestion, telling reporters: "In my experience a collaborative approach is more productive than a confrontational approach and my advice to colleagues is to engage with European partners".
The Treasury is "basically the heart of Remain" and is trying to stop Britain from having full freedom on trade policy after Brexit by keeping it tied to the EU's customs union and to a large extent the single market, Johnson said according to BuzzFeed.
"Finding a mutually beneficial outcome is the only way forward".
He didn't mention Johnson by name.
"He is right about one thing: we are heading for "a meltdown" over Brexit".
Now we know his negotiating strategy has at least one admirer in the British government-Boris Johnson.