IMHO Obama knows that the likelihood of a case appearing in this hemisphere isn’t zero. There is a direct flight from Murtala Muhammed airport in Lagos, where Patrick Sawyer crashed out, to Atlanta.
If it does appear in/around Atlanta the finger will be pointed at Samaritan’s purse and Franklin Graham for allowing it to be brought here.
Obama is looking for a scapegoat. And Franklin Graham is relying on Emory and the CDC to ensure that he doesn’t subsequently become one.
Hope this works out for Graham.