Not going to a 4 year university doesn't coorelate to being stupid or uneducated. It is a fact that the US has too many college students, and thus the major problems with student loans and underemployment (there's a reason why English majors going to Starbucks is a national joke).
I agree there is a lot of college students, but let me hit you with a question that sort of relates. Did you know a lot of countries offer their students FREE education and visas to study overseas. How many of those college students in USA are going back to their home country when they're finished?
Now with that thought, think about this for a sec. If we close off immigration, it'll just be a disaster. lol
Almost none of them are going back because they can make a lot more money here due to our more competitive pay and much lower taxes.
And you're quite wrong if you think anyone wants to close off immigration. The only type of immigration is ever a hotly debated topic by any candidate of any party, is illegal immigration. Students getting students visas and work visas later on wouldn't be affected by any potential candidate.
H1 B1 work visas are in fact an important immigration issue. ONe of the reason the tech sector and silicon vally (facebook etc) support illegal immigrtion and is to help ease support for h1-b1 visas. Its a way of stagnanting wages here in the US for technology sectors. Been i big issue for several years. Disney has been caught up in it ass well. Illegal immigration and h1b1 visas or both opposed by Trump. Technology based companies have been lobbying for more h1b1 visas, that forcing american workers to train their replacements as part of their severence package. Between that, and the tax avoidence, a lot of left leaning companies should be looked at as massive hypocrits. We will ee what happens though.