The Question Not Asked

Here's a question that an unbiased moderator would have asked the candidates during the two-night Democratic debates:

You have said that you are in favor of decriminalizing immigration and giving free health care to illegal immigrants. Most of you have also signed on to the New Green Deal which promises $15+/hour jobs for everyone (presumably including immigrants). Beta even went to far as to make a statement in Spanish that seemed to promise allowing non-citizens to vote. All of this put together is guaranteed to lead to an influx of immigrants not seen since the 19th century. Do you welcome an influx of 10s of millions of new immigrants or do you have a plan for preventing this?