Of course it's not moral. In today's legal climate, whether it's legal is a quesion worth asking. I don't know if it's 'legal'; but, of course, anything Trump does as president is now, by definition, and thanks to the supreme court, not illegal.

Is your point that Auschwitz and the American camps for Japanese people during WW2 were in fact illegal under nazi and American law, respectively? Or that they weren't concentration camps either under your definition?

Nazi concentration camps weren't illegal - but they did exist in a legal vacuum. And Auschwitz was definitely a concentration camp. Don't know anything about Japanese internment camps.