We estimate that the federal government would have to spend $400 billion to $600 billion over 20 years to accomplish these objectives. $100 billion to $300 billion would be spent on removing the entire current undocumented immigrant population from the United States. Moreover, an additional $315 billion would be needed to keep new immigrants from unlawfully living in the country. Not only would it cost the public fiscally, but it would also greatly burden the economy. The labor force would shrink by 6.4 percent or 11 million workers and, as a result, in 20 years the U.S. GDP would be 5.7 percent or $1.6 trillion percent lower than it would be without fully enforcing current law.
I vote go ahead and do it. Even if you go with the high end estimate of $300 billion to get rid of all the illegal interlopers over 20 years you're talking about an average of $15 billion per year. That's not that much relative to the size of the US budget and at least the money would be being spent for something government is SUPPOSED to be doing. Also if it's the low end of the range, $100 billion over 20 years, you're talking about an average of $5 billion per year.
Same kind of thing with the cost of keeping people from entering the country illegally. If it costs $15.75 billion per year to keep a bunch of human dross from flooding into the country unscreened in any way including unscreened for carrying disease I say spend the money. Again, it's something government is SUPPOSED to be doing and it's not that much relative to the size of the Federal budget.
As far as the GDP thing goes, I'm fine with that too. To me if what's important is GDP divided by population size. For example, to me, a population of 100 million people with a GDP of $10 trillion is better off than a population of 200 million people with a GDP of $18 trillion, for example. The GDP would be lower if we get rid of illegal immigrants than it would be if we don't but the population would also be smaller.
Get rid of them. I know we won't because the real truth is that is now a substantial Hispanic lobby in this country that feels an ethnic connection to the illegals and is lobbying to get them in and keep them in and also there are politicians who see keeping them in as being to their political advantage. But if you're showing me what the authors of that report say and ask me if that changes my mind about getting serious about kicking hose already hear out while keeping others from getting in I'm going to say it doesn't. If that's the cost of getting them out of the country and keeping them out and we really COULD get them out and keep them out for that price I'd say it's a bargain.
T-Man you are hilarious 
