They are just crazy. This makes no sense. They are literally just anti-foreigner at this point. These people are not technically immigrants. They are already here for education. By forcing them out of the country, businesses lose money because they usually spend thousands of dollars on housing, groceries, and others. This will have a lasting impact on the U.S. reputation even long after Trump is gone because it gives a strong impression that the U.S. is politically unreliable like many third-world countries when it comes to immigration and foreigners.