every day that goes by and every new user that signs onto twitter signs onto facebook. but the information domain is actually where i think attackers feel like they get the most bang for the buck. information warfare is relatively inexpensive and it's highly impactful. twitter has more users globally than americans has americans. so america has americans. so by just simply retweeting a tweet from president trump, our enemies can immediately and instantaneously spread content that helps them pursue their objectives. >> samantha, thanks very much. and to our viewers, an important note. sam has written extensively on election security. you can read her work on cnn.com. just ahead, a nail-biter in south florida where two latino candidates are facing off as the president's tough tone on immigration impacting this race? ♪ when the moon hits your eye ♪ ♪ like a big pizza pie, ♪ that's amore. ♪ when the world seems... ♪