immigrants carrying deadly diseases such as swine flu, deng fever, ebola virus are concerning. i have serious concern these diseases they begin to spread too rapidly to control. some of these have no known cure. he's warning about the ebola virus, a disease that doesn't exist anywhere in the americas, according to one doctor, an infectious disease specialist. in a daily beast article, he called the suggestion unusually dim witted. yesterday, luke russert asked gingrey about his ebola claim. let's watch this exchange. >> i want to ask you about the letter you sent to the cdc about the children from central america possibly carrying ebola. where is your evidence on that? >> we were given a list of the diseases they're concerned about.