It's very important for Americans to put the size of this...

It's very important for Americans to put the size of this threat in perspective, ... Just as it is a terrible mistake to underestimate a threat, and I think we underestimated a threat of espionage by the Chinese all the way through the 1980s and the 1990s, it is also a big risk for us to overestimate the threat. This is not the worst case of espionage in the 20th century.