From the moment she became prime minister, May has insisted that "Brexit means Brexit", and denied all attempts to push Britain towards a softer interpretation of the referendum result. "The Prime Minister thanks Boris for his work", an emailed statement from May's office said.
After a day when the foreign secretary cancelled meetings for crisis talks at his official residence in central London, Johnson chose to walk from his job - just hours after May's Brexit minister David Davis did the same in protest at her plans.
Davis was appointed two years ago to head up the newly created Department for Exiting the European Union after Britain voted to leave the bloc in a referendum.
Mr Davis was responsible for negotiating the UK's European Union withdrawal.
Asked whether Mr Raab was signed up in full to the plan agreed at Chequers, Mrs May's official spokesman told reporters: "The Government's position was agreed on Friday".
Mr Johnson, who has been foreign secretary since June 2016, had been due to attend a summit on the future of the Western Balkans in London but did not show up - fuelling rumours about his imminent departure. "The prime minister can't deliver Brexit and has zero authority left".
However, he also reportedly threatened to resign from the government on a number of occasions, most recently during talks to resolve a dispute with pro-EU Conservative lawmakers who wanted a greater say for parliament over the final Brexit deal.
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Davis said he had left because he feared the European Union would "take what we have offered already and then demand some more".
The vast majority of Tory MPs, although far from happy with the current state of May's government, are not yet convinced that the solution is to replace the prime minister. Trade Secretary Liam Fox put his name to a newspaper article backing May's plan, and Environment Secretary Michael Gove defended it in a TV interview.
For many Brexit campaigners, Baker's government role gave them faith in the process.
Davis opposed the PM's plan approved at her country residence, Chequers, on Friday.
Jacob Rees-Mogg, the leader of a Conservative group of Brexit supporters, said Davis' resignation proved that their concerns were well-founded and signaled that he would not vote for May's plan if it came to a vote in parliament.
So to criticise Friday's plan, ministers would have to resign and immediately give up ministerial staff, salary, and perks including government cars.
"A very soft Brexit means that we haven't left, we are simply a rule-taker", he told BBC Radio 4's Today programme on Saturday. If May fails to stabilise her party tonight then there is, for the first time, a real risk that Tory MPs will decide that enough is enough.