Tech giant Huawei on Thursday opened a legal front in its counter-offensive against US warnings that it could aid Chinese intelligence services, filing suit to overturn a US law that bars federal agencies from buying its products.

Huawei said the case was filed in a US District Court in Plano, Texas, challenging a 2019 defense bill that prevents government agencies from buying its equipment, services, or working with third parties that are Huawei customers.