US President Donald Trump holds a signed executive order at the White House in Washington, DC, US, May 23, 2025. — ReutersWASHINGTON: US President Donald Trump on Friday threatened Apple and other smartphone manufacturers with a 25 per cent tariff unless their devices are built in the US.Trump initially said the tariff would apply only to Apple -- an unusual move to single out a specific company in trade policy. However, he later expanded the threat to include all smartphone makers.“It...