Bringing in uniquely talented individuals who can distribute expert knowledge accomplishes that.
Bringing an IT worker who does a good JAVA/.Net programming does not accomplish that... right?
Here's some of the high-level effects of bringing international talent of all sorts to the US of year:
1) more talent in the US
2) less talent in other nations
3) the US can ignore pre-university education and opportunity problems
1 and 2 are great for the US government and the top of the US economy, but bad for pretty much everybody else.
3 is pretty awful for a huge number of actual US citizens. Especially given the current state of our nation, this seems like a problem.
I don't believe in "talent". It's all about nurture. If you need more talented people in huge fields for generations, yet half of your nation doesn't have college degrees, the problem is that you are not investing in your people successfully. If we invested more in education and resources for kids, parents, and families from before conception through early childhood and education, we would not have a shortage for fields like... computer science and engineering. These aren't fields that just popped up, they've been a big deal for a century.