Are there any other reasons why Mr. Sullivan won't teach students in his classroom, or is it just because they may be here illegally?
Is he comfortable with his tenure and riding it until retirement, and therefore feeling entitled to spew such nonsense?
It's likely the students in his class, that may be illegal aliens, were brought to the United States by their parents, and not by their own resources.  If so, why deny the children an education?  Why deny anyone an education?  It can only be beneficial to the United States to educate the citizens inside its borders, legal status or not.