"I got the job done by being truthful, but also by letting him be unpredictable and not showing our cards," the departing U.N. ambassador tells NBC News.
The U.S. Geological Survey says a magnitude 4.4 earthquake struck eastern Tennessee and could be felt in Atlanta.
State and federal authorities estimated Tuesday that it will cost at least $3 billion to clear debris.
Avril Nolan, who does not have HIV, was "devastated" when an acquaintance sent her a copy of the ad from the newspaper AM New York back in 2013.
Rescuers began searching for the four people on Sunday, after an ATV the four were believed to be riding was found near an entrance.