General Keith Alexander apparently got pretty busy right after the world discovered that the National Security Agency, which he heads, has back doors built into much of the Internet's encryption.

He has cancelled his spot as a keynote speaker at a cybersecurity conference, three days before he was supposed to go on.

The Dutch telecommunication company KPN announced Saturday that Alexander, who was scheduled to speak at their Cybersecurity Congress, wasn't going to make it, citing pressure on his agenda.