Unfortunately, I can't find a digitized version of the newspaper in any of the online resources I checked. McElwee was Capt. William Eblin McElwee, a Tennessee Confederate veteran who had an interest in history. According to the citation of this book, McElwee's account was only written down a month before it appeared in
The Greeneville-Democrat-Sun:
https://books.google.com/books?id=rG5q7k...22&f=false
Here's a link about McElwee:
http://www.roanetnheritage.com/research/.../index.htm
Note that the page says that "his stories must be taken with a grain of salt". I don't know if that applies to his personal recollections or not.
Here's a couple of links to books that give more context to McElwee's account of his conversation with Johnson:
https://archive.org/stream/presidencyofa...ch/McElwee
and:
https://books.google.com/books?id=rG5q7k...22&f=false