The President signed an executive order which prevents US companies using certain foreign telecommunications. There is controversy over the role of Chinese telecommunications giant Huawei in a number of western countries. Last month the UK’s national security council said the Chinese firm could play a role in providing 5G mobile technology.
In the executive order Trump asserted that “foreign adversaries are increasingly exploiting vulnerabilities in information an communications technology to commit malicious cyber-enabled actions.
“To deal with this threat, additional steps are required to protect the security, integrity, and reliability of communications technology used in the United States.
“I hereby declare a national emergency with respect to this threat.”
The executive order gives the US secretary of commerce the power to “prohibit transactions posing an unacceptable risk to national security”.
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The decision is widely believed to be at least partly targeted at Chinese telecommunications company Huawei.
Huawei fired back insisting they can be trusted to handle sensitive communication networks.
In a statement the company said: “Huawei is the unparalleled leader in 5G.
“We are ready and willing to engage with the US government and come up with effective measures to ensure product security.
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“Restricting Huawei from doing business in the US will not make the US more secure or stronger.
“This will only serve to limit the US to inferior yet more expensive alternatives.”
Huawei has been blocked by Australia and New Zealand from playing a role in their planned 5G networks.
However there was controversy in the UK after Britain’s national security council decided Huawei could provide “non-core” equipment, despite several cabinet ministers reportedly objecting.