Then let them come through normal immigration channels. Interviews, long waits, etc. None of this H1-B or college holdover crud.
Every foreigner coming to the US for education from a non-western country is forking out money with an implicit understanding that the degree so earned would allow the person to work in the US and may open an option for permanent settlement. Of course, it's an immigration scam but it is one that everyone including the US government which issues the visas willingly participates in. Take that away & 95% of those students wouldn't bother applying. Without the option of working in the US, a US degree would be a waste of money & time. There is very little value in their home countries for a US degree except from a couple of famous universities. For too many colleges, this has become a very lucrative way to make money. It will require tremendous will & effort to break this chain.
I concur.