Drug companies have contract with many countries. Some countries get their drugs from the same pharmaceuticals that we do for a lot less. Trump will negotiate with them to get the price for the drugs bat or below the lowest price of any other country. That would save taxpayers 300 billion dollars per year.
And that will put all the drug companies out of business in the US because those prices are what funds their R&D. No more new drugs or cures.
(fyi, nationwide total pharmacy sales of prescription drugs is well below $300 billion).