There's more on Rep. Mike Pence's "middle ground" "guest" worker scheme here. Under that scheme private companies would administer the program, vet applicants, and so forth. The things Pence forgot to deal with include:

* our "guests" would have U.S. citizen children, meaning they would never leave...

* the entire temp agency industry only employs 4 million people now. It couldn't deal with up to three times that many "guests"...

* fraud and conflicts of interest...

* difficulty of doing background checks, especially by private companies...

Previous coverage of this plan here.