The European Union is warning the Trump administration that imposing new tariffs on automotive imports could cost the U.S. economy as much as $14 billion.

In response to a comment request from the U.S., the EU told the Commerce Department’s national security division in a letter sent on Friday that a 25 percent import on car and automotive parts “would in first instance have a negative impact on US GDP in the order of 13-14 billion USD, and the current account balance of the US would be not affected positively,” Politico reports.