Over and above other concerns;
He doesn't support those many American citizens who were immigrants themselves, and had to apply to enter in the first place.
He doesn't support American citizens whose families are overseas who they may want to bring to the USA.
He doesn't support people seeking to become American citizens.
He doesn't support any citizens who have compassion and empathy for the plights of foreign asylum-seekers.
He doesn't support citizens who disagree with him that misanthropic nationalism is the only way to be.
That's just sticking to immigration, specifically.