Christian Lindner, Germany’s finance minister, during a meeting Janet Yellen, US treasury secretary, not pictured, at the annual meetings of the IMF and World Bank in Washington, DC, US, on Thursday, Oct. 24, 2024. Ting Shen | Bloomberg | Getty Images German Finance Minister Christian Lindner on Friday warned that if the U.S. kicked off a trade war with the European Union, there could be retaliation. “Trade controversy sees never