There's really no shortage of biblical material when it comes to good treatment of immigrants/foreigners/strangers. In fact, biblically speaking, every person who is a member of the Church has become a foreigner (1 Peter 2:11); because the language of the New Testament is that the Christian has their politeuma (citizenship, in the sense of being a legal resident of a polis, a city and civil administration); a political-allegiance and attachment ἐν οὐρανοῖς (en ouranois), "in [the] heavens" where Christ reigns as King at the right hand of God the Father. That is, the Christian's political and legal identity is in Christ and Christ's kingship; which renders the Christian, in essence, a foreigner here. Which seriously undermines any attempt to Christianize nativism of any kind.
Now, with that said, it doesn't appear that the the poster cares one whit about what the Bible says.
I am noticing a growing trend among Christians that Jesus, the Bible, and religion in general are generally of no importance--what is important is self-centered tribalism--"what's mine is mine, and what's yours is mine".
Of course in the Talmud the Jewish Sages say that this kind of thinking is the most debased, describing it as a "Sodomite" mindset--i.e. the attitude of the people of Sodom whom the Prophet Ezekiel says were destroyed for their disdain and mistreatment of the poor and needy. Just saying.
-CryptoLUtheran