>>9250388 (pb)
I would like to offer a guess to attempt to answer Q's question
Why did POTUS reply to a tweet from May 30, 2019?
Because "The Washington Post"
ran the Headline
"The FBI texts: Evidence of treason and ‘a coup’?"
Found at
https://archive.is/S5iHJ#selection-898.0-2095.354
without paying for subscription.
Author Twitter with link directly to Washington Post
https://twitter.com/GlennKesslerWP/status/1134054540095971328
The free link may be taken down. So the text is included in the photo replies below.