Leaders of the Detroit Three automakers met Monday with Vice President Mike Pence and the Trump administration's top trade official to discuss their differences over continuing the North American Free Trade Agreement. CEOs Mary Barra of General Motors and Sergio Marchionne of Fiat-Chrysler, Joe Hinrichs, Ford president of global operations, and leaders of several industry advocacy groups met Pence, Robert Lighthizer, U.S. trade representative, and Gary Cohn, director of the National Economic Council, in Pence's office. Auto Industry leaders want the pact covering tariff-free movement of vehicles and parts across Canada, the U.S. and Mexico to continue. The administration has threatened to withdraw from the agreement unless the other two nations agree to substantial changes. Lighthizer is overseeing the renegotiation of NAFTA. The latest round of negotiations of the three-nation trade deal ended last week with little progress.   Ontario Premier: What's at stake for Canada, Michigan in NAFTA negotiations Report: Michigan most at risk in NAFTA negotiations “We view the modernization of NAFTA as an important opportunity to update the 23-year-old agreement and set the stage for an expansion of U.S. auto exports," said Matt Blunt, president of the American Automotive Policy Council, in a statement. "We believe achieving inclusion of strong and enforceable currency discipline and ensuring foreign markets accept products built to our standards are important components of a modern NAFTA agreement." Automakers have been lobbying against an administration proposal to raise from    62.5% to 85% the minimum level of parts that must be made in one of the three countries in order to avoid hefty tariffs. Mexico and Canada have rejected that proposal as well as another that would require half of vehicle content to be from the United States. Most production of small passenger cars has already been moved from the U.S. to Mexico. FCA has stopped making small passenger cars altogether.  If the U.S. were to enact a 35% tariff on light vehicles imported from Mexico, the Center for Automotive Research in Ann Arbor estimates Americans would buy or lease 450,000 fewer vehicles over a