I declare B.S.!!! The real study should have been on the negative economic impact that illegals, including refugees have on our country, including cost to keep criminals in our jails, the cost of feeding, clothing, and housing those who are on government assistance, etc. I used to have a collection of research data from several different agencies and the cost to the state of CA also was astronomical - millions each year - that was just CA. What about jobs lost?
What about the impact on our schools, hospitals, roads, etc. Perhaps most importantly what about the costs to U.S. citizens who have fallen victim to the crimes of illegals?? Murders, rapes, burglaries, etc.,??? No price tag can be put on that!!
I am sorry, I'm not convinced that building a wall would be more expensive, nor have an long lasting benefit. Build the damn wall and quit making excuses!!!!