REUTERS/Tyrone Siu/File Photo

China’s Huawei Technologies Co Ltd has filed a legal motion seeking to declare a US defence law unconstitutional, in the telecom equipment maker’s latest bid to fight sanctions from Washington that threaten to push it out of global markets.

The motion for summary judgment in its lawsuit against the US government, filed late Tuesday in the US District Court for the Eastern District of Texas, asks to declare the 2019 National Defense Authorization Act (NDAA) unconstitutional in an update to a lawsuit brought by Huawei in March.

The NDAA bill, passed by the US Congress last summer, places a broad ban on federal agencies and their contractors from using Huawei equipment on national security grounds, citing the company’s ties with the Chinese government.

Huawei, the world’s largest telecoms network gear maker, has repeatedly denied it is controlled by the Chinese government, military or intelligence services.

US Secretary of State Mike Pompeo kept up pressure on Huawei on Wednesday.

“Huawei is an instrument of the Chinese government,” Pompeo said in an interview with Fox Business Network. “They’re deeply connected. It’s something that’s hard for Americans to understand.”

Glen Nager, a partner at US law firm Jones Day and lead external counsel for Huawei, told Reuters the US court had agreed on a schedule to hold hearings in September on motions by opposing sides.

Huawei recently faced even greater sanctions as the US Commerce Department on May 16 put the company on a trade blacklist that bans companies from doing business with it, in a move which immediately disrupted the global tech sector.

Huawei’s chief legal officer, Song Liuping, on Wednesday said the company was reviewing ways to fight the US ban, which he said was affecting its more than 1,200 suppliers and threatened to affect its 3 billion customers in 170 countries.

Song said Washington’s use of administrative orders and laws to punish a single company “sets a very dangerous precedent.”

“Today it is telecom and Huawei, tomorrow it could be your company, your industry, your customers,” he told reporters at Huawei’s headquarters in Shenzhen.

The ban comes amid an escalating trade dispute between China and the US, the world’s two biggest economies, exacerbated by separate accusations of bank fraud and corporate theft that the United States has made against Huawei and its chief financial officer.

Huawei, which has been given a 90-day reprieve from the ban, has denied its products pose a security threat and protested Washington’s attempts to limit its business.

Vincent Pang, Huawei’s senior vice president and head of corporate communications, said the executive order and blacklist had transcended the boundaries of normal market competition.

“This could lead to the start of the fragmentation of the global tech ecosystem and standards,” Pang said on Wednesday at Huawei’s headquarters.

Pang also said he did not expect the “political” situation to delay the introduction in China of fifth-generation (5G) network technology.

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