Re: Good for Trump
Neither you, nor Trump appear to know what you're on about. From the US Gov website (http://www.dol.gov/compliance/topics/wages-foreign-workers.htm):
H-1B and H-1B1 Specialty (Professional) Workers must be paid the higher of the prevailing wage (average wage paid to similarly employed workers in the occupation in the area of employment) or the actual wage paid by the firm to workers with similar skills and qualifications.
The only way to use H-1B visas to import cheaper foreign labour is to actually break the existing law. Changing this law in the ways suggested by Trump wont stop companies already breaking it from breaking it.
80% of visas being filled by people in level 1 or 2 just means most visas are being used to fill entry level jobs (or that companies are again breaking the law and lying through their teeth to get cheap foreign labour, which law changes won't stop).
Assuming the majority of visas are honestly obtained and filled, there is absolutely no reason to prefer foreign workers over local workers, as they cost the same (in fact probably more, as the companies would generally pay relocation costs, cover the cost of obtaining the visa, etc).
Assuming the majority of visas are fraudulent scams companies are using to cheat locals out of jobs by hiring cheap foreign labour, then changing the law is useless. Laws don't work without enforcement.