President Donald Trump signed a sweeping executive order Monday morning that promises to crack down on “unreasonable or discriminatory” practices by foreign countries that result in Americans paying far higher costs for prescription drugs.

The president directed his administration to tie drug prices that the U.S. pays to those paid by other countries.

President Donald Trump announced that his administration would tackle rising drug costs in the United States by establishing “most favored nation” pricing which would base the U.S. prices of pharmaceuticals on the lowest prices paid by other foreign nations.