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I'm not so sure the foreign-to-foreign communications that are routed through the US are limited to emails, Silash. According to a research company that tracks international communications, calls are included in that:
NSA's Lucky Break: How the U.S. Became Switchboard to the World
A lucky coincidence of economics is responsible for routing much of the world's internet and telephone traffic through switching points in the United States, where, under legislation introduced this week, the U.S. National Security Agency will be free to continue tapping it....
http://www.wired.com/politics/security/news/2007/10/domestic_taps
Yes, the Attorney General did have the authority to tap "purely foreign-to-foreign" calls. But, as Glenn said, the administration claimed that the court said that foreign-to-foreign communications that passed through the US required a warrant.