I would not be surprised in the least if the other world leaders sent "representatives" for all meetings with trump should he actually take office.  I don't think, beyond putin, a one of them respects him or regards him worthy of their time.  but all thoses international deals he might be involved in.  I don't think he has a chance to complete a first term if elected.  I think inevitable he be impeached or assassinated.  don't want to see that of course, but he is very polarizing....people love him or hate him.