Don’t worry, I’m sure they’d execute this plan with the same impressive attention to detail and planning they did to Hurricane Katrina:

A federal database program with a checkered track record could dramatically expand to affect every U.S. employer and worker under provisions of the immigration legislation being considered by Congress.

The program is intended to keep illegal immigrants from working in the United States and to discourage more from entering, but in nearly a decade of small-scale tests, it has had trouble distinguishing between those who are here legally and those who are not. Fixing it and rolling it out nationwide could cost more than $1 billion.

Under the proposal, employers would be required to submit information about their employees to a federally administered electronic system that would automatically check workers’ immigration status. Supporters say it is the only way to prevent employers from hiring illegal workers. But an unusual coalition has emerged to oppose the idea, with labor advocates saying it would dissuade legal immigrants from applying for work, big business groups asserting it would be too bureaucratic and civil-liberties organizations arguing that it would jeopardize individuals’ privacy.

Their opposition softened somewhat this week after the Senate passed a bipartisan amendment intended to give workers more protections and to make the process less burdensome for businesses. The amendment puts the Senate’s version even more starkly at odds with a hard-line House bill that emphasizes aggressively curbing illegal immigration by cutting off the primary incentive — jobs.