If Germany builds its 5G network using Huawei (huawei) technology, the USA will limit the intelligence it shares.
The US believes that allowing the Chinese company Huawei to construct and maintain 5G networks will give the Chinese government a backdoor into communications surveillance.
Last week, it filed a lawsuit against the United States government over a ban that restricts federal agencies from using its products, arguing it is "unconstitutional".
Germany, like other European Union countries, has relied heavily on U.S. intelligence on terror and other threats provided by the National Security Agency, the Central Intelligence Agency and other spy services.
There are only a few companies in the world that can provide the necessary infrastructure for the roll out of 5G.
Allies share information for defence and intelligence cooperation, and companies such as Huawei or ZTE can compromise the confidentiality of such communication, the United States ambassador wrote in the letter.
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The US has been lobbying its allies to boycott Huawei due to national security risks. However, they stressed that the USA would no longer trust Germany's lines because 'the Americans will assume that all information given to Germany will end up in China'.
Reportedly, Huawei has no plans to sue the Australian government, for now.
"Because 5G networks are largely software-defined, updates pushed to the network by the manufacturer can radically change how they operate", NSC spokesman Garrett Marquis told the paper.
Huawei has in recent months met with over 200 politicians to try and smooth over security fears, he added.
However, Germany's Federal Network Agency published tougher security guidelines for telecom providers, which require suppliers of 5G networks to be "trustworthy".
Last week, Huawei filed a lawsuit against the USA for restricting its agencies from the use of Huawei products, saying a law signed by President Donald Trump in August 2018 that barred it and fellow Chinese company ZTE from use in government work is unconstitutional.