The measure is intended to bring car factories to the United States but could increase prices for consumers significantly. The president said the tariffs will start next week.

For now, international auto companies are reluctant to make expensive operational changes, such as adjusting supply chains or relocating more production to the U.S., since it is still possible the tariffs will be withdrawn by Trump if they cause too much economic pain for Americans, according to analysts at the Sanford C. Bernstein research firm.