Cabinet Office rejects Cummings' China breach claim
Dominic Cummings said he was briefed on the breach in 2020 while a senior aide to then-Prime Minister Boris Johnson.
In response, a Cabinet Office spokesperson said: "It is untrue to claim that the systems we use to transfer the most sensitive government information have been compromised."
He told the paper the breach was covered up after he was briefed on the compromised
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