US Senator Mark Warner said on Wednesday he wanted to “more fully understand” Britain’s reasoning for saying it had not seen any malicious activity by China’s Huawei whose equipment US authorities have said could be used by China for spying.

Warner, who is the top Democrat on the US Senate Select Committee on Intelligence, added that the United States and its allies “need to maintain a common front” against risk of using equipment from countries “that do not respect the rule of law.”