@blatham,
If a country can't control its borders then it has a serious and fundamental problem. The fact is that we really don't know who is entering our country illegally across our southern border. It's openness is widely known and it is safe to assume that other folks seeking undocumented entry are using it as well in the crowd of Central Americans. In the current circumstances the President is well within the requirements of his oath of office, both with respect to enforcing the law and protecting our national safety to take the steps he has taken.
It doesn't take much intelligence or experience of life or to recognize that the systematic failure to enforce any major body of laws, and supinely allow widespread, highly visible mass violations of them, constitutes a serious threat to all our laws.
It is unfortunate that neither you nor Mr, Kessler took the trouble to identify or even read the "studies" you postulate exist. Despite that you make these unfounded and very hard to believe (and vague) assertions. Odd that you so insistently demand such citations and data from those who disagree with you. One crime committed in this country by a person who has no right to be here at all is one too many.
I am astounded by you evident taste for this superficial sophistry - filled commentary. It appears you actually consider this to be some form of scholarship. It is very far from that, as are your posts on the matter.