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Problem definition: The uncertainty around trade and foreign economic policy contributes to supply chain risk. Academic/practical relevance: Whether such policy uncertainty will bring some production back to the United States or only redistribute the global supply chains among foreign sources is theoretically ambiguous and warrants an empirical analysis. In this paper, we study the relationship between trade and foreign economic policy uncertainty and the supply chain networks of American firms. Methodology: We use firm-level global supply chain data, transaction-level shipping container data, and policy uncertainty indexes constructed from leading media outlets to study how policy uncertainty correlates with changes in supply chain networks. Results: When U.S. trade policy uncertainty rises, firms with majority domestic sales decrease their supplier base abroad, whereas firms with majority foreign sales …