Well if the issue of American citizenship is cleared up, so that he is a legitimate citizen of the USA, he will get or can have diplomatic protection. But, if he is not a citizen, he can be declared persona non gratia, and sent back to his original birth place. Who wants to flip the coin?
Please, the issue is whether he is a NATURAL BORN citizen eligible to occupy the White House. He is not, but the congress and the judicial branch refuse to do anything about it. He may or may not be a citizen (evidence says not) but even if he was born in the USA, he is not a natural born citizen as required by the constitution