According to R. J. Rushdoony, illegal immigration warrants deportation. While there may be exceptions — e.g., backed by Christ's authority to disciple all nations (Matt. 28:18-20), it seems that Christian missionaries, if necessary, can illegally enter nations that prohibit sharing the Gospel — Rushdoony's point is well taken:
Well, first of all they [illegal immigrants] have broken the law. And justice to everyone requires that the law be upheld. So if they are illegal aliens they should be deported. Now that’s justice because it’s comparable to breaking and entering into a man’s house.Rushdoony also says:
If there should be a change in the immigration laws there are ways of making change but there’s also a failure in our current practice of reciprocity. For example, we allow entrance to peoples who will not allow anyone from our country to migrate there or to own property. That is hardly justice.