Prime Minister Theresa May’s office said May accepted the resignation on Monday and will announce a replacement soon.
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“This afternoon, the Prime Minister accepted the resignation of Boris Johnson as Foreign Secretary. His replacement will be announced shortly. The Prime Minister thanks Boris for his work,” an emailed statement from May’s office said.
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A leader of the campaign to take Britain out of the European Union, Johnson was under pressure to act after the resignation of David Davis as Brexit secretary.
Davis quit late Sunday saying he could not support May’s plans for close trade and regulatory ties with the bloc after the U.K. leaves the European Union next year.
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—With files from Reuters