Huawei is appealing a recent law restricting the purchase of Huawei and ZTE products at the federal level. Huawei is suing the US government in a Texas court, where its US headquarters is located.
The law being challenged is the recent National Defense Authorization Act. It bars the federal government from buying Huawei gear directly, and from doing business with companies that use a substantial amount of Huawei hear. It also prevents private companies from using federal grants or loans to purchase Huawei gear. Huawei claims these provisions are unconstitutional because they violate its right to due process, and are a violation of the separation of powers.
