This seems strange. First a 'minimum wage' seems to be against what Republicans stand for. Second, its pandering to a group that can't vote in US elections. Third, established industry will be against this.
This proposal, at least as described in the article, seems like a great idea. Such a minimum wage would improve (although not fully rectify) the abusive relationship between employers and H-1B workers, while at the same time protecting the interests of American workers by ensuring that their competitors will not be dreadfully underpaid.
Obviously this would be bad for a lot of corporations which currently abuse the program, which is why it will never pass.
E: I decided to open the article. My hunch was correct.
>"to prevent employers from using the program to replace hard-working American men and woman with cheaper foreign labor,"
That said, it's still weird because it'll likely piss off the large donors. I understand that he's trying to take some of Trump's base using Trump's tactics, but the only reason that Trump gets away with it is because he's financing his own campaign and couldn't care less about fundraising.