Boris Johnson has been gaining momentum in his audacious bid to return as British prime minister, with his colleagues deeply divided over the potential comeback and some warning he would plunge the country into fresh chaos.
Former defence minister Penny Mordaunt became the first candidate to officially declare an intention to run to be the next leader of the Conservative party, but Johnson and Rishi Sunak, once his finance minister, led potential contenders as candidates canvassed support ahead of voting next week.
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