On Monday, high-profile Brexiteer and Conservative MP Johnson announced he was resigning from the Cabinet, following the agreement of a Brexit proposal that would see the United Kingdom retain close links to the European Union after exiting the organisation.
Among those rallying around the prime minister was environment minister Michael Gove - a prominent campaigner to exit the European Union alongside Johnson for the 2016 referendum - who said he would not follow suit by resigning.
In her reply, Mrs May told him: "I do not agree with your characterisation of the policy we agreed on at Cabinet on Friday".
"With our leave date fast approaching we have no time for the mechanisms of a leadership challenge", he said.
Ms Caulfield supported Leave in the European Union referendum, and Mr Bradley backed Remain.
Ministers leaving the meeting appeared happy, with chief Treasury secretary Liz Truss telling Sky News it was a "very good meeting, plans are going very well". His departure adds to a crisis over Brexit that threatens to tear apart Prime Minister Theresa May's government.
Mrs May had hoped that the Cabinet agreement secured on Friday at Chequers would help her deliver the "right Brexit" for the UK, with an offer to Brussels to share a "common rulebook" on goods and form a new UK-EU free trade area.
The Sun, Britain's biggest-selling newspaper, said there had been "blunder after blunder" by May.
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Not all accessories work but, for their tests, they used the $39 Lightning to USB 3 Camera Adapter dongle. Those tools end up in lawmakers' hands but, potentially, criminals as well.
"There was a feeling that there's a need to defend the prime minister from somebody who has made a decision for his own benefit".
If Davis' resignation rattled May, Johnson's shook the foundations of her government.
"It seems to me we're giving too much away, too easily, and that's a unsafe strategy at this time", Davis said in a BBC radio interview Monday morning.
"Over the coming days, weeks and months these negotiations will become more intense as we head towards leaving the European Union on March 29, 2019".
She took to the House of Commons today to detail her Brexit proposals amid the chaos.
The former Foreign Secretary says May is destroying Britain's "Brexit dream". "That's not a tenable position". Under Conservative Party rules, a leadership race could be triggered if at least 48 of her MPs declared their support for one.
But leading pro-Brexit legislator Jacob Rees-Mogg said "I don't think a no-confidence vote is immediately in the offing".
Boris's resignation letter is scathing.