Huawei sues U.S. government over ban on its products

Chinese telecoms giant Huawei is suing the U.S. government over Washington's ban on its products.The firm says it has filed a lawsuit in a court in Texas and seeking it to have the ban overturned.The U.S. says the restrictions are in place due to national security concerns, claiming Huawei's products were being used to spy for the Chinese government.Huawei denies that is the case and says the ban is unconstitutional.