The former London mayor had been expected to stand for Conservative Party leader after Prime Minister David Cameron announced he'd step down.
New Brexit shock as Boris backs out of Tory leadership
Cựu Thị trưởng Luân đôn Boris Johnson Source: AAP
Just a week after leading the campaign to withdraw Britain from the E-U, Boris Johnson has ruled himself out of the running to become the U-K's next prime minister.
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