I don't like the policy.
I understand what the legislative history of the Fourteen Amendment is.
However, the U.S. Supreme Court has interpreted our Constitution and federal laws and regulations since it granted itself that power under Marbury.
Wong Kim Ark applies rather than the legislative history of the Fourteenth Amendment.
That ignores some of the other issues discussed in this thread, but is that simple enough?
The subject was set by the OP about "illegal mothers" and their offspring born in the US is that simple enough... and he seems to have posted and ran.