I think he is already doing a pretty good job on some areas. On others I do not agree with him telling the US to invite Illegals and I am a devout Catholic.
Pope Benedict XVI has never said that. He has never commented specifically on immigration policies other than to say that the fundamental solution is to create an environment in their homelands where they would no longer need to emigrate to get work and that illegals in the US should be treated with compassion and dignity. It is some of the local Bishops in the Church that are the really bad ones on immigration not the Vatican.