The executive order Trump is promising will direct the Department of Health and Human Services to tie what Medicare pays for medications administered in a doctor’s office to the lowest price paid by o

The order is based on a "most favored nation" pricing model, which is similar to a policy Trump pushed in his first administration.

The U.S. pays about three times more than other nations for drugs, and Trump's wide-reaching executive order directs pharmaceutical companies to charge similar prices in the U.S. and Europe. The order says its health department will establish a mechanism for patients to buy more drugs directly from manufacturers.