Donald Trump issued a challenge to U.S. trading partners over the weekend, calling on them to bring down their own trade barriers or be met with retaliatory U.S. measures.

The United States is insisting that all countries that have placed artificial Trade Barriers and Tariffs on goods going into their country, remove those Barriers & Tariffs or be met with more than Reciprocity by the U.S.A. Trade must be fair and no longer a one way street! — Donald J. Trump (@realDonaldTrump) June 24, 2018

The Trump administration has insisted that it seeks free trade even while establishing tariffs on certain commodities and countries. The president says his tariffs are aimed at establishing “reciprocity,” balancing foreign trade barriers with new barriers in the U.S.