On paper. How do you know it’s foreign? That’s why they warehouse it. As much as they can. Figure out if it’s foreign later on. Don’t underestimate the laws they will skirt to collect data.

Look up how 5 eyes works.

Why would they ever stop? No one made them stop. They were cleared to operate under that legal theory. Go back and review the exhaustive testimony from that period and you will find they were never forced to stop collecting “potentially” domestic communications. I think its best to assume they are.

Edit: start with Hayden. They admitted exactly how it all works and what the judges allowed. Read up on the many EFF lawsuits that were shut down.