The important thing to remember here is that Canadian drugs aren’t cheaper because they went on a medical vacation to Canada. They are cheaper because Canadian socialized medicine works.
Americans have been traveling to Canada for drugs like insulin when the cost is too high to obtain them in the U.S. This plan would ostensibly make it easier for Americans to obtain cheaper drugs without having to cross the border.
Source: HHS To Allow Imports Of Cheap Prescription Drugs From Canada