None, but if we think about it rationally then calling them "aliens" it is very offensive.
Now as an Aussie-European, I don't try to stick my nose in your politics but when your President in on the brink of declaring war on the EU (I live in the Netherlands) and calling someone who came to your country for a better life because yours is a great country an alien, it is just wrong.
I don't believe in discrimination, that's all I have to say.
