Here's something the Christianist right won't bring up in the immigration debate (although they often refer to it when it comes to marriage equality). Leviticus:
Leviticus 19:33-34 (NIV)
When an alien lives with you in your land, do not mistreat him. The alien living with you must be treated as one of your native-born. Love him as yourself, for you were aliens in Egypt.
A reader adds:
Also see:Leviticus 19:33Exodus 22:21Exodus 23:9Deuteronomy 24:17-18Leviticus 19:9-10Deuteronomy 24:19-22Deuteronomy 10:18-19
I have to say I am very proud of my church in this instance. Human dignity matters.