South Korean companies are reconsidering their $54 billion investment blitz to build electric-vehicle battery plants in the U.S. over concerns President-elect Donald Trump could undo tax credits for EVs.

Some Korean companies have slowed or hit the pause button on any ongoing construction of some plants because they’re concerned about reduced demand for EVs and what Trump would do during a second term in the White House, people familiar with the matter said, asking not to be identified due to the sensitivity of the issue. Posco Future M, which makes cathodes for General Motors, said in a filing in September that it is delaying the completion of its plant in Quebec due to "local conditions.”

Although companies haven’t taken any action yet, many are "anxious” about to what degree Trump would slash government incentives for the EV market, said Kenny Kim, chief executive officer at SNE Research, a Seoul-based research firm that focuses on Korean battery makers.