Seeing as how Trump lost Dade in '16 by nearly 300,000 votes, which was the biggest deficit there for any candidate in history, that lag might continue for quite a while. Trump hardly needs to win Dade (good thing too) but if he can stop the bleeding at about -200K (2012) or better yet but far less likely -150K (2008) that would be a solid improvement.
Trump is going to lose Miami Dade. It just go to show he is out performing there this year. He’ll lose Broward and Palm Beach counties too, but he has more votes in those counties than he did in ‘16 already today.