Clapper appears to have perjured himself.

[suffragette]

24. Your example shows Clapper trying to change the answer he gave

His answer at the hearing is on video:
Clapper responded: "No, sir." When Wyden followed up by asking, "It does not?" Clapper said: "Not wittingly. There are cases where they could, inadvertently perhaps, collect—but not wittingly."


In his interview with the National Journal, he attempts to revise that to:

"What I said was, the NSA does not voyeuristically pore through U.S. citizens' e-mails. I stand by that," Clapper told National Journal in a telephone interview.

As the article from the National Journal notes:
Clapper did not specify at the time that he was referring to e-mail.


Just a tad ironic that Clapper tried to say he gave a different answer (even using "what I said," rather than 'what I meant') when he said this at a recorded hearing and the video is available for review by the public (unlike say one of the secret hearings they hold).