Huawei chief financial officer Meng Wanzhou, was arrested on December 1, 2018 over bank fraud charges and does not think she did anything wrong.
Meng's lawyer, Scott Fenton, accuses the United States of having "breached its duty to be forthright and candid."
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 ruling, which could further deteriorate relations between Ottawa and Beijing, elicited immediate strong reaction from China's embassy in Canada.
This week's hearings dealt with the question of whether the US charges against Meng Wanzhou, the daughter of Huawei's founder, are crimes in Canada as well.
Annual World Economic Forum kicks off with US President Donald Trump criticising "prophets of doom" and teenage activist Greta Thunberg urging global financial elite to act against environmental crisis.
China's Foreign Ministry complained the US and Canada were violating Meng Wanzhou's rights and called for her release.
In a New Year's message to employees, Huawei Chairman Eric Xu said the US government was in the midst of a "strategic and long-term" campaign against the company that would create a "challenging environment for Huawei to survive and thrive".
The 47-year-old Huawei executive was detained during a stopover at the Vancouver airport last December on a US warrant.
The accusation comes at a time of trade tensions between Washington and Beijing and amid concerns in the United States that Huawei's equipment could be used for espionage.
Canada arrested Huawei Chief Financial Officer Meng Wanzhou in Vancouver on Dec. 1 at the request of the United States for allegedly violating US sanctions on Iran.
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