SEOUL, South Korea — Hyundai said today it will significantly increase its investment in the U.S. while Donald Trump is president and is considering building a new U.S. factory, in an unusual disclosure of its mid-term investment plan in the key market.

Chung Jin Haeng, a president of the world’s fifth-largest automotive group, said Hyundai Motor, Kia Motors and their affiliated companies will spend $3.1 billion during the five years through 2021 on research and development and maintaining their factories in Alabama and Georgia.

That represents a 50 percent increase from the $2.1 billion the companies invested in the U.S. in 2012-2016. The increased spending comes mostly from research and development, as the South Korean maker of Genesis and Tucson invests in autonomous driving, environmentally friendly cars and other future technologies.

Chung said Hyundai will study building a new U.S. factory if demand for cars rises during Trump’s administration. He said the new administration’s promise to create 1 million jobs and attract new companies could stimulate domestic demand for cars and other products.

“If there is such a sign, we will immediately review (a new plant),” he told reporters. “We won’t miss when the time is right.”