The credibility earned over the years. I doubt that some well-known brand in the world wants to embarrass himself by any ties to Trump. Regardless of will be impeached or not, but Trump will always remain a traitor to America's interests. On the contrary it can alienate potential buyers.
Give him some time, he'll continue what Clinton, Bush and Obongo were doing, but I don't think he likes going around spreading democracy all over poor countries. Sorry but you're a degenerate if you think Clinton would have been better.