BREAKING: UK's Johnson will resign Thursday as Conservative leader: BBC

Boris Johnson will resign as Conservative party leader on Thursday, the BBC reported, paving the way for a successor to replace him as British prime minister, after dozens of his ministers quit the government.

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"Boris Johnson will resign as Conservative leader today -- he will continue as prime minister until the autumn," BBC political editor Chris Mason reported, adding a Tory leadership race will take place this summer and the victor replace Johnson by October.

This is a developing story.