Huawei, in particular, has been raised for scrutiny by several lawmakers, who worry that the Chinese government could demand access to data on its servers. Earlier this year, the FBI, CIA and NSA warned against use of the company's products or services, citing a potential capacity for "undetected espionage." Facebook has not listed all of the companies included in these agreements -- Apple is not included -- which it said it has been "winding down" and would end with Huawei by the end of this week.

In response, Facebook has said that all data used in its integration with Huawei remained on device, and in its statement Monday insisted these agreements are not at all like the ones used by apps like the one Aleksandr Kogan built that later shared user data with Cambridge Analytica. Senator Mark Warner (D - VA), said he is interested in learning more about how Facebook knows data did not travel to Chinese servers.