President Donald Trump shocked attendees at the World Economic Forum in Davos this week by revealing that he had raised tariffs on Swiss goods to 39%—one of the highest rates imposed on any single country during his second term—following what he described as a frustrating phone call with Swiss President Karin Keller-Sutter.

The revelation, made during Trump's wide-ranging address to global business and political leaders, underscored the deeply personal nature of the president's approach to trade policy and the potential for rapid escalation when negotiations take an unexpected turn.

The Phone Call That Changed Everything

According to Trump's account from the Davos stage, the escalation began after he initially threatened to raise Swiss tariffs to 30% as part of broader trade negotiations. President Keller-Sutter subsequently called Trump to discuss the matter.

"She just rubbed me the wrong way. So I said, 'You know what? Make it 39%.'"

— President Donald Trump, speaking at Davos 2026

The comment drew nervous laughter from some in the audience, though Swiss officials watching were notably less amused. Trump did not provide specific details about what in the conversation provoked his reaction, leaving observers to speculate about the dynamics of an exchange that added nearly $3 billion in annual tariff costs for Swiss exporters.

A Significant Departure From Swiss-American Relations

Switzerland and the United States have historically maintained warm diplomatic and economic relations. Switzerland is home to significant American business investments, and many U.S. companies use the country as their European headquarters. The Swiss financial sector manages trillions in American assets.

Trade between the two nations totaled approximately $75 billion in 2025, with the U.S. running a modest trade deficit. Key Swiss exports to the United States include:

  • Pharmaceuticals: Companies like Novartis and Roche ship billions in drugs annually
  • Precision instruments: Medical devices, watches, and scientific equipment
  • Chemicals: Specialty chemicals and industrial compounds
  • Machinery: High-precision manufacturing equipment
  • Financial services: Banking, insurance, and asset management

Market Impact

Swiss stocks fell on the news, with the Swiss Market Index declining 1.2% in trading following Trump's comments. Pharmaceutical giants were particularly affected, as drug exports represent a substantial portion of Swiss-U.S. trade.

The Swiss franc initially strengthened against the dollar—a typical safe-haven response—before settling as traders assessed the broader implications. Currency strategists noted that trade tensions tend to create unpredictable cross-currents in forex markets.

European Leaders React

Trump's Swiss tariff announcement came as part of a broader Davos address that included tariff threats against multiple European nations. The president announced 10% tariffs on imports from eight NATO members, including France and the United Kingdom, with rates scheduled to increase to 25% in June.

French President Emmanuel Macron responded forcefully: "Tariff threats are unacceptable. Europeans will respond in a united and coordinated manner should they be confirmed. We will ensure that European sovereignty is upheld."

European Commission officials indicated they were preparing potential retaliatory measures, though emphasized a preference for negotiated solutions. The prospect of a transatlantic trade war has rattled business leaders on both sides of the ocean.

The Pattern of Personalized Trade Policy

The Swiss episode reflects a distinctive feature of Trump's approach to trade negotiations: the centrality of personal relationships and perceived slights. Throughout his first term and now into his second, Trump has frequently tied trade policy decisions to his interpersonal interactions with foreign leaders.

Trade policy experts note several implications of this approach:

  • Unpredictability: Traditional diplomatic channels become less reliable predictors of policy
  • Rapid escalation: Disputes can intensify quickly based on a single conversation
  • Business uncertainty: Companies struggle to plan when policies can change overnight
  • Negotiating leverage: Some argue the unpredictability provides strategic advantage

Swiss Response and Next Steps

The Swiss government has not yet issued a formal response to the tariff announcement, though officials indicated they would seek clarification through diplomatic channels. Switzerland's State Secretariat for Economic Affairs is expected to conduct an impact assessment and consider response options.

Options available to Switzerland include:

  • WTO dispute resolution: Filing a formal complaint, though this process takes years
  • Bilateral negotiations: Seeking direct talks to resolve the dispute
  • Retaliatory tariffs: Imposing reciprocal measures on U.S. goods
  • Coalition building: Working with EU partners on coordinated responses

Implications for Global Trade

The Swiss tariff escalation adds to growing concerns about the stability of the rules-based international trading system. Combined with ongoing disputes with China, Canada, Mexico, and now multiple European nations, the Trump administration's tariff policies are reshaping global commerce patterns.

For American consumers and businesses, higher tariffs typically translate to higher prices for imported goods and potential supply chain disruptions. The pharmaceutical sector is particularly sensitive, as many essential medications are manufactured in Switzerland.

As one veteran trade diplomat observed: "When tariff rates are determined by how a phone call goes, the entire framework for international commerce becomes unstable. Every country now has to factor in the possibility of sudden, dramatic policy shifts."

For now, Swiss exporters are left calculating the cost of a presidential phone call gone wrong—and hoping future conversations proceed more smoothly.