The US has warned the British government it “would be madness” to use Huawei technology in the UK’s 5G network.
A US delegation presented the UK with new evidence claiming to show security risks posed by using the Chinese firm.
US President Donald Trump has sought to pressure Prime Minister Boris Johnson on the issue.
A decision is expected this month on whether to allow Huawei to supply some “non-core” parts for the UK network.
A US delegation led by deputy National Security Adviser Matt Pottinger met ministers in London on Monday.
Senior US officials handed over a dossier of technical information which sources claim challenged British intelligence’s own technical assessment that it would be possible to use Huawei in the 5G infrastructure without risks to national security.
US sources refused to comment on the content of the file.
The move is being seen as the latest round in an intense lobbying effort by the Trump administration as the UK government prepares to makes its decision on the 5G network.
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