Trump Targets Samsung and SK Hynix With Semiconductor Tariffs

The tariff is the deal now

For months, the Trump administration has been quietly pressuring foreign semiconductor firms to build US factories, dangling tariff relief as the carrot. This time the carrot turned into a stick aimed directly at South Korea.

On September 2, Commerce Secretary Howard Lutnick told CNBC that semiconductors made in the United States would avoid tariffs, while those produced abroad would face charges for accessing the world’s largest market. When pressed on Bloomberg TV the same day, he did not mince words: Samsung and SK Hynix “must build factories here.”

This is not the usual diplomatic framing. Previous administrations — including Trump’s first term — treated semiconductor investment as a negotiation, not a demand. The distinction matters because it signals that Washington has moved from encouraging Korean capital to demanding it on US terms.

Who wins, who loses

South Korea loses immediately. Samsung and SK Hynix are the backbone of the country’s export economy. Together they account for a significant share of national GDP and employ hundreds of thousands across their supply chains. Forcing them to accelerate US fab construction shifts capital expenditure away from domestic expansion, R&D cycles in Seoul and Yongin, and the very production capacity that makes Korean memory chips competitive.

The US wins in the short term. Lutnick stated the administration’s goal plainly: raise America’s share of global semiconductor production from under 2% to 40–50%. He cited TSMC’s $26.5 billion Arizona campus and Micron’s $25 billion计划 as proof the model works. The implication is clear — if Taiwanese and American firms are already complying, Korean firms have no excuse.

China loses second-hand. Whatever leverage Seoul had as a neutral supplier between Washington and Beijing is eroding. Korean fabs in the US are US-controlled, US-regulated, and US-supplied. That removes a key node from any future Chinese encirclement strategy, but it also means Seoul surrenders its remaining bargaining chip: the ability to play both sides.

Japan is watching carefully. The same day Lutnick spoke, Trump mentioned Japan alongside South Korea in relation to the Alaska LNG project, suggesting Tokyo may face identical pressure later. If Washington treats Seoul as the test case and succeeds, the playbook transfers seamlessly to Toyota, Sony, and Kioxia.

The SanDisk angle

Here is what English-language coverage often misses: Samsung acquired SanDisk’s memory business in 2015 for $13.7 billion. SanDisk-branded products, particularly NAND flash memory, became a major revenue stream for Samsung’s Memory Division. The US presence of that operation — manufacturing and headquarters functions tied to the former SanDisk identity — is exactly the kind of foothold Washington is now scrutinizing.

The administration appears frustrated that Korean FDI has historically favored incremental US expansion over greenfield investment. Samsung’s existing Texas operations are real, but they represent mature capacity, not the massive new fab construction that Lutnick is demanding. SK Hynix’s Iowa memory plant is similarly established. Washington wants fresh billions committed on US soil, not continued reliance on legacy facilities.

The SanDisk connection reveals a deeper pattern: the US is no longer satisfied with Korean companies operating American factories. It wants them built as if the US were the primary market. That is a fundamental shift in the alliance’s economic architecture.

The Alaska lever

While the tariff threat dominates headlines, Trump used the same September 2 Rose Garden remarks to cement an second pressure point: the Alaska LNG project. He confirmed Japan and South Korea are involved in the proposed natural gas pipeline and liquefaction complex stretching 1,300 kilometers from North Slope to Nikiski.

This is not incidental. Alaska LNG represents one of the few remaining large-scale energy projects where Korean state-linked and private capital could be mobilized quickly. By mentioning South Korea and Japan together in the same breath, Trump is signaling that investment requests will come bundled — semiconductors here, energy infrastructure there, and compliance expected from both simultaneously.

Seoul’s Blue House responded cautiously, saying the government is “closely monitoring” developments and will “consult closely with the US side to ensure no adverse impact on Korean companies.” That language is deliberate hedging. The Korean government knows it cannot veto US trade policy, but it also cannot openly resist without triggering retaliation.

What happens next

Two scenarios are plausible. The first — and most likely — is that Samsung and SK Hynix announce new US fab commitments within months, framed as voluntary investment but clearly extracted under tariff duress. This would mirror the TSMC Arizona model and give the Trump administration a victory lap heading into future negotiations with Japan and possibly the European Union.

The second scenario is more dangerous. If Korean companies resist or delay, the administration could expand the tariff net beyond semiconductors. Politico reported earlier this year that the US is considering duties on laptops, game consoles, and data center servers — products that rely heavily on Korean memory chips. That would turn a targeted policy into a broad trade war, hitting American consumers and technology companies in the process.

Either outcome reshapes the US-ROK alliance. The relationship was never purely economic — it was always anchored in security cooperation against North Korea and China. But tying tariff policy to investment demands transforms an alliance partner into a negotiating opponent. That is a calculation Washington is now willing to make, and Seoul has very few cards left to play.