It affects citizens who want to get married to non-citizens.
I'm worried about this. My wife isn't from one of the banned countries, but who knows if that will remain the case in the future?
So your great-great-grandparents moved to America, killed most of the local population and now you think you own the place? The USA is made of immigrants.
The sad thing is, those with the most options, who pay the most taxes, will do just that. They'll take their expertise and productivity and contribute them somewhere else. And the racists will congratulate themselves on how smart they are while the country continues its crumbling slide into fascism.