1. Foreign means not from a country, Greenwald was born in Queens, NY - just because he lives abroad, that doesn't make him foreign.

2. He works for Guardian US, a US company based in New York.

3. According to the editor, it's actually easier for the Guardian to publish stories on this topic through their US subsidiary, rather than the UK, because free speech protections are stronger in the US, so the US connection is very important to them and they view themselves as a global media operation now (just moved to a .com domain for example).