It's not a whole lot different from "Why are we hiring all these women?" or "Who invited the deaf people to this party?"
All are discriminatory statements, and what Trump said is discriminatory on the basis of race i.e., racism.
I do not know where you are from, and understand that in many countries of the world, discrimination against women and even more so, people with disabilities, is commonplace or even expected. But in western democracies, the concept that all are equal is a generally held value, enshrined in law, and hard won from civil rights movements.