To that end, Warner, the top Democrat on the Senate Intelligence Committee, has pressed Facebook to detail if its partners included Huawei and ZTE, according to a spokeswoman. On Tuesday, Warner -- appearing at an event hosted by Axios -- said his still-unanswered question stems from the "ongoing threat these Chinese telecom companies pose."
A sign for the ZTE booth is seen at the Mobile World Congress in Barcelona, Spain.
Photo: AP"I believe it's a serious danger. I've been disappointed we've not gotten a straight answer," said Warner, adding it would be "very surprising to me if they somehow excluded the Chinese telecom providers."
Facebook declined to comment on its relationship with Huawei or ZTE. Representatives for both Huawei and ZTE did not respond to requests for comment.
Earlier on Monday, Facebook rebuffed any charges that it had violated its users' privacy. Ime Archibong, the company's vice president of product partnerships, said in a blog post that Facebook had partnered with device makers in the days before smartphones had app stores so that consumers could "use Facebook whatever their device or operating system."
US officials long have raised security concerns with Huawei and ZTE. In May, for example, the Pentagon confirmed it had ceased allowing military service members to purchase either firm's phones on its bases, citing threats to "personnel, information and mission."
But fears about Huawei and ZTE predate the arrival of President Trump. A 2012 report from lawmakers on the House Intelligence Committee that found "risks associated with Huawei's and ZTE's provision of equipment to US critical infrastructure could undermine core US national-security interests." The firms have denied the charges.
Facebook said its arrangements with device makers were controlled "tightly from the get-go." The social giant said it had started phasing out its partnerships in April, and before that, it was "not aware of any abuse by these companies." But the New York Times, which first reported the relationship, found that some device makers, such as BlackBerry, may have accessed information about Facebook users and their friends even if they had opted out of having their information shared in that manner.
The new revelations have since raised the spectre that Facebook could face additional fines and other penalties for its handling of users' sensitive data.
Washington Post