By David Schwartz, Marvin Griff and Kerem Bilge ( January 1, 2018, 2:27 PM EST) -- As he promised during the presidential campaign, President Trump moved quickly after entering office to renegotiate and modernize the North American Free Trade Agreement. Following the fifth round of negotiations, which concluded on Nov. 21, 2017, in Mexico City, U.S. Trade Representative Robert Lighthizer, the U.S. government's chief trade policy negotiator, signaled concern for the future of the negotiations. Ambassador Lighthizer stated that, while some progress has been made to modernize NAFTA, "I remain concerned about the lack of headway. Our teams will be meeting again next month in Washington. I hope our partners will come to the table in a serious way so we can see meaningful progress before the end of the year."[1] His words indicate a lack of progress, possibly paving the way for a NAFTA withdrawal that President Trump has threatened repeatedly....