Bush already said he wants to expand the Food Stamp program for immigrants. Also legal residents are "entitled" to many programs that illegals are not. At least the Libertarians wouldn't be giving the free health care and welfare programs that is the cause of much of this illegal immigration.
Yes, yes I know all about the Libertarian Paradise. No war, no borders, no laws (well, minimal laws, but why spoil the parallels?) no poverty, no disease and, of course, this will happen the one day that Emperor Harry Browne (who needs a Congress to go arguing over the details, right?) takes office.
But, there are those open borders. Oh, yes, and that rigid nonaggression policy. It seems to be: If you get attacked, apologize.
Or something like that.