Cabinet Office rejects Cummings' China breach claim
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 data in 2020 while a senior aide to then-Prime Minister Boris Johnson.
In an interview with the Times , Cummings said China obtained "vast amounts" of "extremely secret" information from the UK intelligence services and parts of Whitehall.
The Cabinet Office has rejected Dominic Cummings' claim that China breached high-level systems used to transfer sensitive government information.
Cummings said China breached high-level systems used to transfer so-called Strap material, a government classification for highly sensitive intelligence data.
In the interview, he said the compromised information included: "Material from intelligence services. Material from the National Security Secretariat in the Cabinet Office.
"Things the government has to keep secret. If they're not secret, then there are very, very serious implications for it."
He told the newspaper: "The cabinet secretary said, 'We have to explain something; there's been a serious problem', and he talked through what this was.
"And it was so bizarre that, not just Boris, a few people in the room were looking around like this - 'Am I somehow misunderstanding what he's saying?'"
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