POTUS did talk about Witch hunt before, it was about the russia collusion. He was hunted. And you have to check his last tweets, where he states, that nobody found anything on the russia thing. The last post means, in a sentence: "It was a witch hunt all a long!" It's not a "go" to hunt "witches" like Hillary.

Think about it. You can also use the keywords trump and witch hunt for a youtube search, to check, that he stated this in the past.