Trump and his top trade negotiator, Robert Lighthizer, are especially vociferous critics of the WTO. They argue that the trade organization constrains America's ability to counter unfair trading practices by China and other countries.
The United States drew a hard line for renegotiating the North American Free Trade Agreement on Wednesday, demanding major concessions aimed at slashing U.S. trade deficits with Mexico and Canada and boosting U.S. content for autos.
With the U.S.-Mexico-Canada Agreement coming into effect Wednesday, the U.S. trade ambassador reminded a congressional committee that within the velvet glove of trade diplomacy, Donald Trump's White House wields an iron fist of zero-tolerance enforcement.
U.S. Trade Representative Robert Lighthizer, who is leading the talks for the Trump administration, said there were still some "major, major issues" to resolve and praised Liu's commitment to reform in China.