SHENZHEN, China (AP) — Chinese tech giant Huawei is launching a U.S. court challenge to a law that labels the company a security risk and would limit its access to the American market for telecom equipment.

Thursday's announcement comes as Huawei Technologies Ltd., the biggest global maker of network equipment for phone and internet companies, tries to fight off U.S. efforts to persuade allies to exclude the company from next-generation telecom systems.

Huawei said it filed a lawsuit asking a U.S. federal court in Texas to invalidate a portion of this year's military appropriations act that bars the Trump administration and government contractors from using Huawei equipment.

The company denies U.S. accusations it facilitates Chinese spying or is controlled by the country's ruling Communist Party.