The State Department’s top European affairs official has resigned and is leaving the foreign service.

Wess Mitchell, assistant secretary of state for European and Eurasian affairs, a Trump appointee, submitted his resignation on Jan. 4, effective Feb. 15, according to the Washington Post. Mitchell’s departure after 16 months comes as President Trump’s approach to transatlantic alliances such as NATO has strained relationships with some traditional U.S. partners abroad.

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