Using Huawei in UK 5G networks would be 'madness', US says

British ministers told allowing Chinese firm access would put intelligence sharing at risk

Using Huawei technology in UK 5G networks would put transatlantic intelligence sharing at risk, senior US officials have told British ministers, warning that allowing the Chinese firm access would be "nothing short of madness".

The extraordinary American ultimatum came as a special delegation led by Donald Trump's deputy national security advisor, Matt Pottinger, presented an incendiary dossier they said featured new evidence of the security risks of relying on Huawei technology in future phone networks.