Obviously the answer is "Yes"
am I missing some subtlety here?
Saying "No" - like Clapper did - would only be risky if, like Clapper's example, it was a lie
Ergo, the answer is obviously Yes. The only security threat might lie in explaining in exactly which circumstances the illegal spying on citizens takes place. (such as when the citizen is talking to someone not on American soil - which I believe is already exempted, but you get the gist)