Trump's Renewed Tariff and Security Pressure on South Korea and Risks for Semiconductor Negotiations

Executive Summary

President Trump’s recent remarks targeting South Korea are not impromptu rhetoric but rather structural pressure based on the 'free-rider' logic previously advanced by Federal Reserve Board Governor Steve Myron during his tenure as Chairman of the Council of Economic Advisers (CEA). It is highly likely that targeted tariffs on semiconductors, the designation of South Korea as a high-risk country for transshipment, and demands for increased defense cost-sharing will be pursued as an interconnected negotiating package. The most probable scenario is the continuation of parallel pressure on both the tariff and security tracks. The South Korean government urgently needs to unify its response under a single control tower, as a fragmented approach across the Ministry of Trade, Industry and Energy, the Ministry of Foreign Affairs, and the Ministry of National Defense risks allowing the U.S. to exploit inter-ministerial differences to maximize concessions. Companies need a strategy that simultaneously reduces tariff risks and the verification burden by preparing their country-of-origin verification infrastructure and adjusting investment schedules for production facilities in the U.S. In the short term, this requires pre-emptively reviewing data for CBP verification and activating joint industry response channels. In the medium term, establishing a consultative body with the USTR and the Department of Commerce to seek a downgrade in the risk classification is necessary.

I. Issue Analysis

Issue Analysis: The Renewal of Trump's Tariff and Security Pressure on South Korea

1. Background and Developments

This is not the first time President Trump has singled out South Korea. Just over two weeks after publicly expressing dissatisfaction by mentioning the contents of a phone call with President Lee Jae-myung, he has targeted South Korea again [1]. In a Fox News interview released on August 30, President Trump claimed the U.S. spends billions of dollars helping NATO and other allies but gets "almost no help" in return, specifically naming South Korea as "the example" [1]. In the same interview, he again brought up South Korea’s refusal to provide support during the mine-clearing operation in the Strait of Hormuz, stating, "You have to remember those things" [4]. This can be interpreted as signaling his intention to demand corresponding concessions in future trade and defense cost-sharing negotiations [4].

To understand the context of these remarks, one must consider the "Great Transshipment Scam" report released on August 13 by the White House Office of Trade and Manufacturing Policy (OTMP). The report points out the practice of Chinese products undergoing simple processing in third countries to launder their country of origin and classifies over 40 countries, including South Korea, into risk groups based on their degree of integration with Chinese supply chains [3]. The specific mention of the Gyeonggi semiconductor belt has significant implications for South Korea [3][6]. An EAI analysis has previously assessed this measure as "a system of constant surveillance based on structural exposure, not the detection of individual violations," and described it as "an extension of the Trump 2.0 administration's security-economy linkage and its demand for allies to share costs" [3].

An examination of the policy direction of a potential second Trump administration reveals that these remarks are not impromptu rhetoric. Steve Myron, Chairman of the White House Council of Economic Advisers, has previously argued that the United States has shouldered excessive costs while providing economic and security public goods as a "benevolent hegemon" [9]. According to this logic, allies' currency devaluation and trade surpluses are the result of free-riding that increases the U.S. burden, and the solution is to redistribute responsibility through tariffs and currency management [9]. The U.S.-South Korea alliance has been identified as one of the testing grounds for this policy of linking economics and security [9].

2. Current Situation

On September 2, U.S. Secretary of Commerce Howard Lutnick stated that "targeted, thoughtful" tariff policies on semiconductors are being prepared, reaffirming the existing position that tariffs will not be imposed on companies that produce within the United States [7]. This, in turn, can be read to mean that tariff risks remain for companies producing outside the U.S., particularly the South Korean semiconductor industry. Concurrently, follow-up verification procedures are underway following the designation of high-risk transshipment countries, and the possibility of working-level friction over the scope of country-of-origin data to be provided is being discussed [3].

A similar trend is detectable on the defense and security track. Bruce Klingner, a senior research fellow at the Mansfield Foundation, pointed out in an NK News op-ed that President Trump's decision to scale back U.S.-South Korea joint military exercises is raising concerns about the alliance's credibility [17]. This perspective shows that pressure for security cost-sharing is not mere rhetoric but is leading to actual adjustments in the combined defense posture.

U.S. pressure on allies is not limited to South Korea. During the same period, President Trump pressured the United Kingdom to increase its defense spending by raising the Falkland Islands issue [10][16], and escalated conflict with Canada by exchanging retaliatory tariff measures [12][18]. The SCMP analyzes that other trading partners are watching this hardline stance toward Canada as an opportunity to reassess their diversification, leverage, and credibility in negotiations with Washington [18]. This has implications for how South Korea should position itself in negotiations. Meanwhile, the SCMP also reports the view that President Trump's series of hardline remarks are part of a political event management strategy ahead of the midterm elections [14].

3. Key Actors and Positions

President Trump and the White House: They are consistently maintaining a policy of linking security and economics to pressure allies into sharing more responsibility. Repeatedly citing South Korea as an example of 'free-riding' is seen as an attempt to use both defense cost-sharing and tariff negotiations as leverage simultaneously [1][4][9]. Bringing up the refusal to dispatch troops to Hormuz is a rhetorical tactic that converts past security cooperation records into a pressure card for trade negotiations [4].

U.S. Department of Commerce (Secretary Lutnick): By stating that semiconductor tariffs will be 'targeted' and reaffirming the principle of exempting companies that produce in the U.S., the department is creating an incentive structure that pressures South Korean companies to expand their production facilities in the United States [7].

White House Office of Trade and Manufacturing Policy (OTMP): Through its designation of high-risk transshipment countries, the OTMP has explicitly placed the Gyeonggi semiconductor belt under structural surveillance [3]. This department's actions are bureaucratic in nature, accumulating independently of the high-level diplomatic track, and are likely to persist regardless of whether a summit takes place [6].

South Korean Government: As seen when the contents of his call with President Lee Jae-myung were publicly discussed, Seoul is in a situation where communication between the two leaders is being repurposed by President Trump as a tool for negotiation pressure [1]. An EAI analysis has previously suggested that complete removal from the list is unlikely, proposing that a realistic goal would be to seek a downgrade in the risk classification and to keep the verification burden at a manageable level [3].

South Korean Semiconductor Industry: With the Gyeonggi semiconductor belt specifically targeted for surveillance as a transshipment risk, the industry is directly exposed to demands for providing country-of-origin verification data [3][6]. At the same time, it must prepare for the possibility that production location within the U.S. will become a criterion for tariff imposition, depending on how the U.S. designs its targeted semiconductor tariffs [7].

4. Key Issues

First, tariff pressure and demands for security cost-sharing are not on separate tracks but are being combined into a single negotiating package [1][4][9]. President Trump's remarks depart from the past practice of treating defense cost-sharing and tariffs as separate issues.

Second, as the verification process for high-risk transshipment countries unfolds concurrently with semiconductor tariff negotiations, South Korea is facing multiple negotiation fronts [3][7]. The scope of country-of-origin data to be provided and the overhaul of verification infrastructure are practical tasks that must be prepared for, regardless of the outcome of the tariff negotiations.

Third, it is unclear whether President Trump's remarks foreshadow specific policy decisions or are a form of political messaging ahead of the midterm elections [14]. This uncertainty itself complicates South Korea's efforts to formulate a negotiation strategy.

Fourth, as seen in the cases of Canada and the United Kingdom, the U.S. approach to pressuring allies varies by country, meaning there is no single negotiation model for South Korea to follow [10][12][18]. The responses and outcomes of these other countries will likely serve as reference points for South Korea in assessing its own negotiating leverage.

II. In-Depth Analysis

In-Depth Analysis: The Structure and Background of Trump's Tariff and Security Pressure on South Korea

1. Analysis of Root Causes

To read President Trump's singling out of South Korea merely as an expression of personal grievance is to miss the nature of the current situation. The remarks are rooted in the policy theory advanced by Steve Myron, Chairman of the White House Council of Economic Advisers. Myron diagnoses that the United States has provided security and economic public goods as a 'benevolent hegemon' [9]. He believes that excessive costs have been imposed on the U.S. in this process [9]. In particular, he argues that the dollar's function as the key currency has led to persistent currency distortions [9]. His core criticism is that some countries have intentionally devalued their currencies to gain a competitive trade advantage [9].

The prescription derived from this diagnosis is clear. It is a refusal to tolerate any more 'free-riding' by allies and friendly nations [9]. The plan is to revive American manufacturing through tariffs and currency management [9]. Here, security and economics are not separate domains but are bound together in a single negotiating package [9]. This is the structural reason why South Korea is simultaneously facing targeted semiconductor tariffs and demands for increased defense cost-sharing.

President Trump's repeated mention of South Korea's refusal to provide support during the mine-clearing operation in the Strait of Hormuz is part of the same context [4]. This remark reveals his intention to use security contributions as leverage in future trade negotiations [4]. The Hankyoreh interpreted this as "suggesting that he could demand corresponding concessions in future U.S.-South Korea relations, such as in trade or defense costs" [4]. In other words, the root cause is not a reaction to a specific issue but the negotiating philosophy of a potential second Trump administration itself, which treats security contributions and economic concessions as fungible assets.

2. Structural Context

Political Structure

The U.S. domestic political calendar is influencing the timing of this pressure. The SCMP points to a pattern where President Trump diverts attention from domestic pressure regarding a potential war with Iran by creating friction with Canada or making statements about North Korea [14]. The argument is that, ahead of the midterm elections, hardline statements against allies have political utility in appealing to his domestic voter base [14]. The remarks targeting South Korea are not unrelated to this trend. The choice of Fox News as the venue itself suggests the message was aimed at his domestic supporters [1].

Within the U.S., there is also an ongoing debate over the legal basis for tariff policy. The Atlantic Council assesses that despite numerous court rulings challenging the legal authority for tariff policies, the administration has not wavered in its determination to maintain a protectionist 'tariff wall' [2]. According to this tracker, the administration has now entered a phase of building new tariff barriers based on Section 301 of the Trade Act [2]. In effect, legal uncertainty is leading to a diversification of policy tools.

Economic Structure

The discussion on semiconductor tariffs is taking concrete shape with the remarks from Commerce Secretary Lutnick. He announced that "targeted, thoughtful" tariff policies on semiconductors are being prepared [7]. At the same time, he reaffirmed the principle that tariffs would not be imposed on companies producing within the United States [7]. This principle, in turn, works as a structural disadvantage for the South Korean semiconductor industry, which has a high proportion of overseas production.

This is combined with a separate track: the designation of high-risk transshipment countries. The White House Office of Trade and Manufacturing Policy's "Great Transshipment Scam" report specifically named the Gyeonggi semiconductor belt [3][6]. An EAI analysis defines this measure as "a system of constant surveillance based on structural exposure, not the detection of individual violations" [3]. With these two tracks—tariffs and transshipment verification—simultaneously targeting the semiconductor belt, the industry faces the burden of having to manage two separate response channels.

The PIIE points out that such a tariff expansion could have unexpected side effects. It argues that if future tariffs on 16 trading partners are combined with an agreement to ease tariffs on “non-sensitive” items with China, this could paradoxically result in companies returning to China[5]. This case illustrates how conflicts can arise between policy objectives when U.S. policies to check China are combined with pressure on allies.

Security Structure

The Brookings Institution analyzes that the Trump administration's National Defense Strategy puts forward the logic that "the United States is stretched to its limits, simultaneous threats are real, and America cannot bear all the burdens alone" [11]. This strategy demands that allies spend more and take on greater regional responsibilities [11]. Brookings points out that while this logic is appealing on the surface, its actual implementation requires complex coordination [11].

In this context, the decision to scale back U.S.-South Korea joint military exercises can be interpreted not just as a military adjustment but as a negotiating lever. Bruce Klingner, a senior research fellow at the Mansfield Foundation, assessed that this decision is raising concerns about the alliance's credibility [17]. He believes this trend actually expands Kim Jong Un's strategic room for maneuver [17]. In effect, concerns are being raised even within the U.S. expert community that pressure for security cost-sharing could undermine the alliance's own deterrent capabilities.

3. Historical Precedents and Comparative Cases

The Trump administration's method of pressuring allies is not limited to South Korea. A similar pattern is observed with NATO member states. The BBC reported on an instance where President Trump pressured the UK to increase its defense spending by raising the Falkland Islands issue [10]. It cited a Telegraph report that U.S. defense officials had even considered using the UK's sovereignty over the Falklands as leverage to induce NATO allies to meet their spending commitments [10]. This method of linking a security-related matter to the completely separate issue of territory and sovereignty is identical in logical structure to the combination of semiconductor tariffs and defense cost-sharing demands on South Korea.

The friction with Canada also serves as a point of comparison. When Canada announced retaliatory tariffs, President Trump retorted that Canada had harmed American farmers [12]. In the process, the very survival of the United States-Mexico-Canada Agreement (USMCA) became uncertain [12]. The SCMP analyzes that other trading partners, including China, are watching this case as a test for gauging how to respond to U.S. pressure [18]. The options presented to other countries are whether to push back like Canada, adopt a diversification strategy, or seek a compromise through negotiation [18].

The case of reviewing tariffs on musical instruments shows how broadly the Trump administration could use Section 232 of the Trade Act. The PIIE points out that a plan to classify brass instruments like trombones, trumpets, and tubas as national security threats and impose tariffs on them is under review [13]. This is an example of how the concept of national security is being expanded to justify tariffs in areas unrelated to actual security threats. While semiconductors are different from musical instruments in that they have actual security relevance, this case confirms the administration's general tendency to continuously broaden the scope of legal tools like Section 232.

Actions at the G20 level also provide context. The United States is pressuring G20 countries to reduce their trade imbalances with China [15]. In this process, reaching a joint declaration has been difficult due to disagreements over subsidies, rare earth export controls, and issues related to Russia [15]. This shows that the U.S. is employing both individual bilateral pressure and pressure through multilateral forums simultaneously. The pressure on South Korea, which also involves parallel bilateral tracks (tariffs, defense costs) and a multilateral track (the list of high-risk transshipment countries), is consistent with this trend.

4. Key Variables Shaping Future Developments

The first variable is the specific design of the semiconductor tariffs. The key will be the actual criteria applied to the 'targeted, thoughtful' tariffs mentioned by Secretary Lutnick [7]. If production within the U.S. is used as the criterion for tariff exemption, the pressure on South Korean companies to expand their U.S. investments could intensify.

The second variable is the practical progress of the verification procedures for high-risk transshipment countries. How working-level friction between the U.S. and South Korea over the scope of country-of-origin data provision is resolved will determine the actual burden on the Gyeonggi semiconductor belt [3].

The third variable is the U.S. midterm election schedule and President Trump's domestic political calculations. If the 'distraction' pattern pointed out by the SCMP is repeated, the frequency and intensity of his remarks toward South Korea are likely to fluctuate based on domestic political needs [14].

The fourth variable is the shifting broader context of the U.S.-China summit. With tensions over technology regulations building at the bureaucratic level, separate from the summit track, South Korea is likely to remain a direct stakeholder regardless of the meeting's outcome [6]. This could lead to pressure on Seoul becoming an independent negotiating agenda in its own right, rather than just a byproduct of U.S.-China conflict.