Rahman went on to say that even if the prime minister doesn't fire Johnson, "he might resign anyway, calculating that his prospects of succeeding May will be enhanced if he can champion a clean break from the European Union". "He hasn't said anything that people didn't know he was thinking about".
"But when it comes to paying for access to the market, that won't happen any more than we would expect them to pay us for access to our market".
Former education secretary Nicky Morgan went in more robustly, telling the BBC's Westminster Hour that Johnson needed to get his act together quickly. "Ain't no stopping us now!"
"What that teaches me is that really is it. Rien ne va plus".
This week Mrs May came out in defence of free markets in the wake of Labour's tub-thumping calls for renationalisation, and if she is to regain the political initiative then she must spell out a clear vision for Britain that ordinary people can relate to. "There can be no monkeying around".
He also touched on other subjects like calling for a faster increase in the minimum wage and for public sector pay rises.
"Government is working on what would need to be put in place if there is no deal, what we are also working on is ensuring we get a deal, get the right deal for the United Kingdom", May said.
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The Scottish Tory leader has called for "serious people" to take charge of Brexit, a remark seen as an attack on Mr Johnson, arguing that "over-optimism" about Britain's post-exit future "sells people short".
"As Conservatives, we have a vision of a country that works for everyone, not just the privileged few - precisely the direction I set when I became Prime Minister past year".
As a member of the EU, Britain now enjoys tariff-free trade with the EU's market of more than 500 million people. "So my determination to act on those concerns, and crucially, to fulfil the promise of my first speech on the steps of Downing Street, is greater than ever".
"Conservatives have a plan to make that a reality". She spent much of Friday schmoozing European Union leaders at a summit in Estonia, including efforts to convince Chancellor Angela Merkel that the two-year transition deal she wants after 2019 is a good idea.
"I think one of the problems we have at the moment and what kind of rankles with me a little bit is that we have got to stop talking about the party", trade minister Liam Fox told an event. Mujtaba Rahman, managing director for Europe at the Eurasia Group, said "many in the party believe he is goading May into sacking him, so that he can become a "Brexit martyr" on the back benches".