The move escalates a trade dispute over how much tech companies can be taxed outside their home countries.
The Trump administration is denouncing the fact that the tax levels vary greatly between members of the global trade body.
Tariffs from 2018 made raw metals from outside the country more expensive. Now finished products could get extra taxes, too.
Will the U.S. get into trade fight after trade fight with every country that tries to tax big tech?
Corn and soybean farmer April Hemmes isn't sure she'll be able to regain the Chinese buyers she lost during the trade war.
There are plenty of other fights brewing, especially between the U.S. and Europe.
The U.S. accuses Chinese actors of systematically stealing American ideas, including agricultural technology.