One leading privacy lawmaker said it was time to "start treating the adtech industry as a national security threat."

Some lawmakers are calling for widespread reforms following years of surveillance scandals and abuses across successive U.S. administrations. But even if the spy law known as Section 702 expires on April 30, the government's spy powers will not automatically lapse.

FBI director Kash Patel told lawmakers that the agency is actively purchasing commercially available location data, which can track Americans without needing a warrant.