U.K. Foreign Secretary Boris Johnson, one of the most prominent Brexit advocates in British government, announced his resignation on Monday, signaling a chaotic new phase in the nation's already messy process of withdrawing from the European Union.
May's Cabinet agreed to the plan after a 12-hour meeting Friday, but government unity began to fray within hours. The challenge is all very well for people to say I wouldn't do this.
Leaving the gathering, leading Brexiteer Jacob Rees-Mogg said he did not think there would be a confidence vote over Mrs May. He urged May to abandon her plans and take a tougher line with Brussels.
Johnson, who assumed his position as foreign secretary in July of 2016, previously admonished then-GOP presidential nominee Donald Trump for his criticism of North Atlantic Treaty Organisation.
"Brexit should be about opportunity and hope", Johnson wrote.
Those remarks came during the notoriously boisterous prime minister's "question time" at the House of Commons.
Detailed talks were held between Number 10 and MPs on Saturday in a bid to reassure backbenchers over the Government's plans for Britain's future relationship with the European Union, while further meetings took place on Sunday and Monday lunchtime.
In his resignation letter, Johnson complained that May's Brexit bargaining stance gave away too much.
He told the BBC that he thought the United Kingdom was giving away "too much, too easily" and predicted that the European Union would be demanding more concessions in talks. In her statement to members of Parliament, May acknowledged the splits in her government, saying of the ministers who quit: "We do not agree about the best way of delivering our shared commitment to honoring the result of the referendum".
And yet, unlike me, she still has power.
Under her proposal, a treaty would be signed committing the UK to "continued harmonisation" with EU rules - avoiding friction at the UK-EU border, including Northern Ireland.
Mrs May is expected to tell MPs that the strategy agreed on at Chequers is the "right Brexit" for Britain. Euroskeptic Conservative lawmaker Peter Bone said party activists felt "betrayed" by the government plan. This sets up an overdue moment of truth for the Tory Brexiters.
"My concern is about the policy rather than the individual", he said. They have organised a highly successful Commonwealth summit and secured record worldwide support for this government's campaign for 12 years of quality education for every girl, and much more besides.
Britain and the European Union hope to reach broad agreement by October so the national parliaments of the remaining countries can ratify a deal before Britain leaves.
Labour MP Andrew Adonis said Raab's appointment could spell the "death" of the Tory leader, while writer and editor Hitcham Yezza said Brexit has now become even more "shambolic".