The fact is that few Americans would be turned down for such a job. I'd like to hear the story of Americans who have been. It might change my mind.
Can you explain how the gubmint is going to monitor who, which Americans actually have applied for these supposedly "undesireable" jobs to begin with?
Supposedly, the only jobs given the "working to become legal" workers are those American workers who either did not desire to fill them or there were not enough American workers to meet the demand and the jobs had to be filled with immigrants.
What's is going to be? A new gubmint department estabsished for no other reason than to check the thousands of employers and millions of jobs Americans didn't want or couldn't fill?
Who is smoking what?
One of my history profs used to pick grapes and grapefruits with the migrant workers when he was a teenager. He was fired when his boss found out he had a high school diploma.