Allowing employers to hire immigrants almost guarantees that unskilled natives will have more trouble finding steady work. Between 2000 and 2005 the unemployment rate among eighteen-to-sixty-four-year-old natives without high school diplomas rose from 10 to 14 percent; among their foreign-born counterparts it fell from 9 to 7 percent.(The numbers are from this article from the Center for Immigration Studies by Steven Camarota.)
Jencks contends that a balance must be struck between the needs of native dropouts and of desperate immigrants, and that
The only way to strike a balance is to crack down on employers who hire illegal immigrants, offer visas to more unskilled foreign-born workers, and set the number of visas with an eye on how that number will affect job opportunities for unskilled natives.Note the strategically deployed passive voice. Any administration that did this would have to be willing to offend powerful employer lobbies, powerful immigrant lobbies, those do-gooders who feel sorrier for uneducated foreigners than for uneducated natives, plus it would have to somehow insulate from politics the setting of those visa numbers. Good luck with that.