It was not a formal announcement of a tariff but a statement of intention.

“TSMC is exempted from the chip tariffs because it has set up plants in the US,” said Taiwan minister Liu Chin-ching.

UMC is also exempt because of its manufacturing agreeement with Intel.

Apple, which announced a $100 billion manufacturing investment in the US yesterday, will also be exempt, said Trump.

A Korean trade official said that Samsung and Hynix would not be paying 100% tariffs and the country would be subject to a favourable tariff level under a trade deal.

Trump warned against making a pledge to invest and then not going through with it.

“If, for some reason, you say you’re building and you don’t build, then we go back and we add it up, it accumulates, and we charge you at a later date, you have to pay, and that’s a guarantee,” said Trump