U.S. Trade Representative Robert Lighthizer discusses the United States-Mexico-Canada Agreement as President Trump and Treasury Secretary Steven Mnuchin look on Oct. 1, 2018. Lighthizer is now the chief U.S. negotiator in trade talks with China.

U.S. Trade Representative Robert Lighthizer discusses the United States-Mexico-Canada Agreement as President Trump and Treasury Secretary Steven Mnuchin look on Oct. 1, 2018. Lighthizer is now the chief U.S. negotiator in trade talks with China.