One of the co-authors of the Heritage Study claming immigration reform would add $6.3 trillion to the deficit, Jason Richwine, advocated barring immigrants from entering the United States based on their IQ in 2009. From Wonkblog’s Dylan Matthews:
Richwine’s dissertation asserts that there are deep-set differentials in intelligence between races. While it’s clear he thinks it is partly due to genetics — “the totality of the evidence suggests a genetic component to group differences in IQ” — he argues the most important thing is that the differences in group IQs are persistent, for whatever reason. He writes, “No one knows whether Hispanics will ever reach IQ parity with whites, but the prediction that new Hispanic immigrants will have low-IQ children and grandchildren is difficult to argue against.”
Toward the end of the thesis, Richwine writes that though he believes racial differences in IQ to be real and persistent, one need not agree with that to accept his case for basing immigration on IQ. Rather than excluding what he judges to be low-IQ races, we can just test each individual’s IQ and exclude those with low scores. “I believe there is a strong case for IQ selection,” he writes, “since it is theoretically a win-win for the U.S. and potential immigrants.” He does caution against referring to it as IQ-based selection, saying that using the term “skill-based” would “blunt the negative reaction.”
The main premise of the heavily disputed Heritage Study is that undocumented immigrants will be unable to reach education and income levels high enough to make them a net plus to the economy, even after several generations.
Update: A spokesman for Heritage disavowed any association with Richwine’s 2009 study.