Trumps Executive Order says that if the Pharma Companies refuse to lower prices to be more in line with what other countries are paying that the President will utilize the FDA to REVOKE APPROVAL for drugs in the United States meaning that Pharma cant sell their drugs in the US if they don't comply!
FULL TEXT OF THE EO CAN BE FOUND HERE: whitehouse.gov
the Commissioner of Food and Drugs shall review and potentially modify or revoke approvals granted for drugs, for those drugs that maybe be unsafe, ineffective, or improperly marketed