US demands regional steel, aluminum in Nafta auto rules

The Trump administration is demanding the use of North American-made steel, aluminum, copper and plastic resins in cars and trucks sold under North American Free Trade Agreement rules, as it seeks to give US industry a boost. People briefed on the matter said US negotiators issued the proposal, which could force automakers to shift sourcing of some components to North America from Asia, during talks on Friday to overhaul Nafta.