For example, to be a "potential sponsor" according to the DHS regulations, one must file significant paperwork -- such as showing ID (U.S. or foreign) and proof of residency. The adult applying must also submit documents about the child.

I'd like to know what kind of documents are needed for the child. And why this DHS "official" is not named.

As far as an ID, and proof of residence, those are very easily obtained by illegals, at least in California.