I'm on a TN, as are many of my co-workers. Trump's campaign website did not say anything about Canadian NAFTA work permit holders. We aren't too worried, but we also need know that a Canadian subsidiary + J-1 isn't hard to get if we really have to go that way.

I'm not on TN but I have used it in the past. If Trump ends NAFTA I would imagine the TN visa would go with it since it's part of NAFTA. I'm sure it would disrupt a lot of lives.