For those who don't know, an unlisted video in YouTube is a different type of private video. "Unlisted" means that only people who know the link can view it (such as friends or family to whom you send the link). An unlisted video will not appear in any of YouTube's public spaces (such as search results, your channel, or the Browse page)
Trump is bypassing the process that kills videos by doing this. Very clever.
Pass the video on to all you know and don't know.
Trump bump
Since this ad is appearing on TV, he does not need it to be Youtube public. It will get spread by social media and blogs plus reach the non-internet audience.