Washington has pushed allies to bar Huawei from building next-generation 5G mobile networks, claiming its equipment can be used to spy for Beijing.
The letter sent to Prime Minister Justin Trudeau comes as Canadian senators called for sanctions on Chinese officials.
Michael Kovrig and Michael Spavor were detained in what was widely seen as a retaliatory measure against Canada after Huawei executive Meng Wanzhou's December 2018 arrest in Vancouver.
The US Commerce Department and other agencies signed off on the rule change, which is awaiting publication in the Federal Register.
The ruling, which could further deteriorate relations between Ottawa and Beijing, elicited immediate strong reaction from China's embassy in Canada.
The US decision “violated basic norms of international relations" and "harmed China ’s interests,” said a Chinese foreign ministry spokesman.
Feeling the pinch of rising Chinese tech, the Silicon Valley giants become political to stay in the game.
US Commerce Department has said that it was tightening sanctions on Huawei — seen by Washington as a security risk — to include denying it access to semiconductor designs developed using US software and technology.
The US Commerce Department said it was amending an export rule to "strategically target Huawei's acquisition of semiconductors that are the direct product of certain US software and technology."
The companies said Samsung will use Xilinx’s “Versal” computing chips, which will help with a technology called beamforming that lets 5G gear handle more wireless data than previous generations of networks.
Sources say the Trump administration agreed to new measures to restrict the global supply of chips to China’s Huawei Technologies
The new provisional license expires on May 15. Prior to the extension, the previous license was set to expire on April 1.
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