** U.S.-listed automakers fall after reports that the Trump administration wants North American-built vehicles to have 82% regional content to qualify for preferential treatment under the U.S.-Mexico-Canada Agreement

** Shares of General Motors GM.N and Stellantis STLA.N fell 3% and 2.3%, respectively, in morning trading

** Ford F.N pared previous gains and was up about 4%

** The proposal seeks 50% of a vehicle's value be produced in the United States, according to people familiar with the U.S. negotiating position