His family name is Drumpf (German) so it's a possibility. But like all shabbos goys, it reaches a point where it makes no difference if he is Jewish or not because he does everything he is told.

Also, like u/Redsky mentioned, it's also likely that he wasn't Jewish but later converted like his daughter.

To be honest I think it would be better if the USA had a Jewish president like Bernie Sanders. Cut the middleman. A Jew who is openly Jew might actually be able to say no to the mad schemes of his fellowmen.