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

In signing an executive order aimed at reducing U.S. drug prices, President Donald Trump said some prices would be cut in half or more "almost immediately." But the order is light on details of how the plan would be implemented.

If prescription savings are to be passed on to Americans not on Medicare, Congress likely would have to pass a law to enact any price reductions.