"Illegal alien" is an actual legal term. It refers to a person inside this country who has violated immigration law to be here and who is a citizen of another country.
A "legal alien" is a citizen of another country who is inside this country and has complied with immigration law to be here.
Stop pandering and using disingenuous arguments. You know exactly what is meant by the term "illegal alien" and know it's neither racist nor dehumanizing. It defines a legal status.