I can't understand what the purpose of having a 'z' visa holder leave the country in order to apply for permanent resident visa (green card)?  Surely this will be abused - the workers family will remain in the US and the green card may not be forthcoming for some or no reason.  Why can't the green card application be submitted within the US?

This looks to me either as a needless impediment or a disguised attempt to punish the z visa holder somehow.  Will the worker be able to keep his US job if he has to leave the US, and for long if 'delays' occur? Is it reasonable to expect a worker to leave his family behind in an indeterminant status - particularly if the children were born in the US with automatic US citizenship (per the Constitution).

And what is the purpose of having the temporary workers having to leave the US and stay out for a year before being able to apply again for temp. worker permit?  Once again, what about his US family?

I smell hidden agendas in these provisions.  And I don't see any way that a temp. worker in the future can move into green card status - even if his children are US citizens.

And of course the 'longer fence' is just ridiculous on its face.  The geographic features of long portions of the border suggest that a fence can't or won't be built, and as long as some areas are unfenced, the migration will move there.