Yes, assuming the US lets the GCHQ store US information. I'd say its more likely AT&T, Verizon, et al. just provide a "Prioritized Law Enforcement" API and sell

Yes, assuming the US lets the GCHQ store US information. I'd say its more likely AT&T, Verizon, et al. just provide a "Prioritized Law Enforcement" API and sell access to the Government.