I too am a Catholic theologian.  I'm a bit surprised that you use the term, "sovereign state" given that in Catholic teaching and theology, this has always been a bit suspect.  

I agree that "chain sponsorship" is not the best policy for immigration, and that part of the bill is acceptable.  Limiting refugees in the way this bill proposes is reprehensible, from a moral point of view, and is completely contrary to Pope Francis's teaching.  It's also ridiculous to limit unskilled laborers.  I don't see too many middle-aged white guys looking to pick avocados.