Apple Inc. fell in extended trading after President Donald Trump told the Wall Street Journal that U.S. tariffs could be placed on iPhones imported from China.

Trump also told the newspaper that he expects to move ahead with increasing duties on goods from China to 25 percent.

Trump suggested that 10 percent tariffs could be placed on mobile phones, like the iPhone and laptops made in China, dealing a potential blow to Apple Inc.

“Maybe. Maybe. Depends on what the rate is,” Trump told the Wall Street Journal in an interview. “I mean, I can make it 10%, and people could stand that very easily.” Apple stock fell about 1.6 percent in extended trading following the comments.

The U.S. is due to raise import duties on about $200 billion worth of goods from China to 25 percent from 10 percent on Jan. 1. The vast majority of iPhones and other Apple products are built in China and then exported globally.

So far, Apple’s most lucrative devices, like the iPhone and iPad, have been left out of U.S. tariffs. Earlier this year, Apple said products like the Apple Watch and AirPods would be affected before the U.S. said it wouldn’t impose taxes on such items. Still, the company warned in September, that other items, like the Mac mini, Apple Pencil stylus, and some cables and cases, could be harmed.

The company has made a small percentage of older iPhone models in Brazil and India in recent years, in part to avoid local taxes on imported goods.

Apple (AAPL) fell 1.5 percent to $171.88 at 4:26 p.m. in New York following the Journal’s report on Trump’s remarks.