After a day when the foreign secretary canceled 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.
The two resignations leave May badly exposed and raise questions over whether she will stand firm in her commitment to pursue a "business friendly" Brexit, or will be faced with more resignations and calls to quit herself.
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.
After Cameron resigned following defeat in the Brexit referendum, Davis was appointed back in government by May, Cameron's replacement.
David Davis quit as Brexit Secretary on Sunday.
"The prime minister can't deliver Brexit and has zero authority left". There was no immediate comment from Baker.
The U.K.is due to leave the European Union on March 29, 2019, but the nature of the country's trade relationships with the European Union has yet to be determined.
But it soon began to unravel, when Mr Davis resigned late on Sunday (July 8) and launched a no-holds-barred attack on her plan, calling it "dangerous" and one which would give "too much away, too easily" to European Union negotiators, who would simply ask for more.
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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". For many Brexit campaigners, Baker's government role gave them faith in the process.
The resignations came just days after May announced she had finally united her quarrelsome government behind her plan for a divorce deal with the EU.
Brexit-backing lawmakers have been angered by May's plans, saying they will keep Britain too close to the European Union and limit its ability to strike new trade deals.
Top EU officials said Brexit was becoming a mess for Europe following the resignations.
Labour's deputy leader Tom Watson said the government was "in meltdown".
"It seems to me that the national interest requires a secretary of state in my department that is an enthusiastic believer in your approach, and not merely a reluctant conscript", he wrote.
- His departure leaves May with a hard task to find a replacement who can win the confidence of the pro-Brexit faction in May's Conservative Party whilst delivering on a Brexit plan that outraged many of them.
Davis opposed the PM's plan approved at her country residence, Chequers, on Friday.
His departure was hailed by pro-Brexit Conservative lawmakers, who have long considered May too prone to compromise with the EU.