Boris Johnson's Downing Street administration is in turmoil after one of his top advisers quit.
Lee Cain says he'll step down as director of communications despite having been offered a promotion to chief of staff at Number 10.
It's leading to reports of a rift in Downing Street between camps of advisers and officials, and speculation about further resignations.
Opposition Labour leader Keir Starmer says it's a distraction from important challenges.
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