President Donald Trump doesn’t seem to have given up on the dream of a “Made in USA” iPhone. That’s a major problem for Apple as it looks to avoid being hit by tariffs, while also avoiding the ruinous costs of an American-manufactured smartphone.

Apple previously said in February it would spend $500 billion to expand many of its operations in the U.S., including assembling AI servers in Houston.

Apple CEO Tim Cook publicly addressed the impact of tariffs on the iPhone maker’s business for the first time on an earnings call Thursday, saying they could add $900 million to the company’s overall costs.