Today, Vatican City operates something like a miniature Monaco. Totally surrounded by Rome, the city-state is in no way self-sustaining. Yet it does have a large, unionized workforce, a highly professional diplomatic corps, and a fairly good cash flow (due to support from Catholic parishes).
What it does not have is any immigrants. Nor refugees. None.
Since none at all are accepted, one begins to see a bit of a credibility problem. Namely, why should the Catholic hierarchy ask the United States to do (i.e., accept huge numbers of immigrants and refugees) what its own little country will not?
http://www.thesocialcontract.com/artman2/publish/tsc0504/article_473.shtml
Vatican State: 7 refugees approved by Francis. With population of 800, that’s more than any other nation in the world.