“Locating millions of immigrants for deportation would take a very dramatic increase in domestic surveillance and enforcement, including door-to-door roundups. Mistakes would inevitably be made, with legal immigrants and citizens swept up in the process. Courts that handle immigration cases would be overwhelmed.
Mass deportations would also harm the economy. Most undocumented workers are in relatively low-skilled jobs, but about a quarter are in white-collar jobs. Of those, about half are in management, finance or professional careers. Removing large numbers would have a very significant impact on the businesses that employ them. Undocumented workers make up about 5.1% of the American workforce at a time when a 4.9% unemployment rate shows that labor markets are growing tight.”USA Today