China's ambassador to Canada accused the country of "white supremacy" this week when it demanded the release of two Chinese-arrested Canadians detained in China last month, calling the detentions "self-defensive tactics."
Canada has launched a campaign with allies to win the release of detained Canadians. The United States, the United Kingdom, the European Union and Australia have submitted observations.
Trudeau appealed to US President Donald Trump, and the White House described the arrest of Canadians as "unlawful."
On Friday, Poland was arrested by a Huawei director and one of its former cybersecurity experts charged her with espionage for China.
The development comes at a time when the US is putting pressure on its allies, Huawei, the world's largest manufacturer of telecommunications network equipment, not to deal with data security concerns.