we've more than doubled our domestic terrorism caseload from about 1,000 to around 2,700 investigations, and we've surged personnel to match, more than doubling the number of people working that threat from a year before. >> joining me now, former director of the national intelligence james clapper. he is now a cnn national security analyst. thank you, sir. appreciate you joining us. director, it's hard to believe that it wasn't so long ago that people were shocked by the idea that domestic terrorism was such a major threat. what happened? >> well, count me among those who were shocked. it's hard not to think back 20 years ago and what we just commemorated, the anniversary of 9/11, where we're completely focused on the foreign terrorist threat. and now at a very high volume and velocity, that's all changed, and it is a profound