The OP means that Trump didn't use quotation marks or mention that it was a quotation. (I myself didn't realize it was a quotation.) There is no attribution or quotation marks in the tweet.
I found the attribution of the quote very informative and am very surprised it is currently downvoted. My own summary of the tweets is also downvoted, not sure what I could/should add to it: https://news.ycombinator.com/item?id=23347395
I tried to neutrally summarize the tweets, in case people wanted to know what they said without clicking.
