Britain's most senior official in charge of negotiating the country's exit from the European Union resigned on Sunday, accusing Prime Minister Theresa May of undermining Brexit with her plan to keep close trade ties with the bloc.
After a day when the Foreign Secretary cancelled meetings for crisis talks at his official residence in central London, Johnson made a decision to walk from his job - just hours after May's Brexit minister David Davis did the same in protest at her plans.
She is set to tell MPs there have been "robust views" on Brexit among cabinet members and is also expected to announce a replacement for Davis.
The staunchly pro-Brexit Conservative MP Andrea Jenkyns tweeted: "Fantastic news".
Davis's late-night resignation undermines May's fragile government.
Yours ever, David Davis.
Davis's resignation could embolden Brexit-supporting Conservative parliamentarians to challenge May's leadership.
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Ms May told the House of Commons that both Mr Davis and Mr Johnson had made important contributions to Britain, but did not agree with her about "the best way" of delivering Brexit.
"The mess caused by Brexit is the biggest problem in the history of EU-UK relations and it is still very far from being resolved, with or without Mr Davis", he said.
Conservative lawmaker Jacob Rees-Mogg, a leader of the party's "hard Brexit" faction, compared May's plan to an egg so softly boiled that it "isn't boiled at all".
"This afternoon, the Prime Minister accepted the resignation of Boris Johnson as foreign secretary", a Downing Street spokesman said.
The appointment comes after Davis resigned overnight, saying he would be unable to deliver the PM's post-Brexit trade strategy - which was approved by the cabinet on Friday - as he did not "believe" in it.
The 69 year old had reportedly threatened to quit several times over a perceived lack of firmness in Britain's negotiating stance but had remained strictly loyal to the prime minister in public.