See this Metaculus question if you would like to know more about QAnon.
Why think that Donald Trump (@realDonaldTrump) would tweet about QAnon? First and foremost, he is a prolific tweeter (about seven per day). Secondly, there have been many QAnon supporters at his recent rallies and it seems very likely that he saw them. Finally, on 8/24/2018 Donald Trump met with Lionel Lebron, a promoter of the QAnon conspiracy, at the Oval Office.
As much as you might hate to admit it, this story has legs y'all. Recently, Reddit banned QAnon for "inciting violence, harassment, and the dissemination of personal information".
Resolution criteria: question resolves as affirmative if Trump mentions QAnon in a tweet before November 1, 2018. We can resolve this question by noting the President's twitter account, or a credible media report as he often deletes his tweets (which is problematic because these are official presidential records). Interestingly, recently he was ordered to unblock Twitter users