Exactly which imports or industries would face tariffs was not immediately clear. Preliminary discussions have largely focused on several key sectors that the Trump team wants to bring back to the United States, the people said. Those include the defense industrial supply chain (through tariffs on steel, iron, aluminum and copper); critical medical supplies (syringes, needles, vials and pharmaceutical materials); and energy production (batteries, rare earth minerals and even solar panels), two of the people said.