Apple’s decision to expand its manufacturing footprint in India has triggered a sharp response from US President Donald Trump, who warned on Friday that iPhones sold in the United States must be made domestically—or face heavy tariffs.

Apple’s efforts to diversify its production away from China have been undermined by President Trump’s renewed threat to impose a 25% tariff on iPhones not made in the US.

Apple Inc. faces a potential 25% tariff on iPhones made outside the U.S., directly threatened by President Trump. The company’s shift to India and Vietnam was meant to reduce China risk, but it’s now clashing with U.S. political pressure.