The US has warned Britain that including Huawei's equipment in future 5G mobile networks would be "nothing short of madness".
Senior officials in Washington have repeatedly stated that the US would reassess intelligence sharing with the UK if the Chinese telecoms firm was given any role in Britain's 5G infrastructure.
A delegation from the US capital – including Donald Trump's deputy national security adviser, Matt Pottinger – presented British ministers with new technical evidence on Monday about the risks, according to the Financial Times.
There are growing expectations that Prime Minister Boris Johnson will decide in favour of allowing the use of Huawei equipment in some "non-core" parts of the network, with a final decision due later in January, the newspaper reported.
Allowing Huawei into Britain's 5G networks "would be like putting Russia in charge of anti-doping of world athletes", one US representative was quoted as saying.
The showdown comes just days after the head of MI5 said he had "no reason to think" the UK's relationship with America would suffer if Huawei was allowed involvement in the 5G communications network.
"Perhaps the thing that needs more focus and more discussion is how do we get to a future where there's a wider range of competition and a wider range of sovereign choices than defaulting to a yes or no about Chinese technology," Sir Andrew Parker said in an interview with the FT.
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But a US official who was present at the latest meeting between US and British security officials told the FT: "It's the strong view and assessment by the US by a broad range of officials both political and professionals that any amount of equipment from untrusted Chinese vendors is too much.
"Any amount caries the risk of compromising infrastructure, private citizens' data and corporate secrets and sensitive information.
"It raises the questions, why do any amount of business with people you don't trust?"
The government under former prime minister Theresa May granted the Chinese telecoms giant restricted access to build "non-corRead More – Source