I think it was a VERY loaded question and an obvious trap. They will go back 50 years and pick out ONE sentence he said and "innocently" ask about it. Fukkin MSM!! He doesn't follow Wikileaks, but at the time I think we ALL were Wiki fans!!!
I'm not sure about the questions posed before this one, so I can't put any further context into it for you.
Here's a link to the event in question.
https://www.nbcnews.com/politics/white-house/after-assange-arrest-trump-says-he-knows-nothing-about-wikileaks-n993486