Is the Term "Illegal Alien" a Racial Slur?

The Conservative Voice is reporting that atty. Domingo Garcia claims the term "illegal alien" is a racial slur:

Appearing on KLIF Radio’s Gregg Knapp show, attorney Domingo Garcia said that using the terms illegal alien or illegal immigrant is a “racial slur”. Garcia said that those who use it, in reference to Hispanics, are racist.

Knapp advised Garcia that using the term “illegal aliens” or “illegal immigrants” is an accurate term applied to [their] legal vs. illegal status in the country and a true depiction of the fact that they are illegal. Garcia said: “Using words like illegal alien is like calling people derogatory names…like calling people nigger!”

I wonder how this plays in the Black Community.