Non-republican, or DEM, or whatever, what he's proposed is essentially a promise to buy huge amounts, and get a quantity discount. This is win-win. The manufacturer gets a guaranteed run, and the buyer gets a lower price. Administration costs may eat up the savings, I don't know, but the general idea of getting a good price on quantity buy is sound. Trump has also talked about getting a "most favored nation" clause in the contract. This is a fairly common licensing/purchase type of deal, where the biggest buyer gets the best deal.
No question, this is a market distortion. But it might be one that has benefit to the public.
The gov’t saves on one end to have it eaten up on the other and the drug price won't change to the patient.