The president has long complained that the United States pays more for medicines than other wealthy countries. But he offered no clear legal authority to mandate lower prices.

President Donald Trump is set to sign an executive order Monday morning that promises to crack down on “unreasonable practices” by foreign countries that suppress drug prices abroad, a White House official said.

The president said his executive order will require pharmaceutical companies to price drugs in the U.S. in line with the lowest price they charge in other countries.