summer: You lost me here - do you mean for employers of undocumented workers?
I mean a telephone number that employers can call to verify that a potential employee is legally able to work in the USA.
If we can have a "National, Instant Background Check" for gun buyers, why not the same for potential employees. A simple phone call could verify a workers status (the only information that has to be released is a yes or no regarding the ability to legally work in the USA, no personal information would be released).
One of the points boosters of illegal immigration claim, is that would be impossible to create a verification system. My point is that we already have such a system. There was the political will to create the first, there appears to be no political will to create the second.