On March 12, 2018, President Trump signed an executive order invoking the Committee on Foreign Investment in the United States authority to block Broadcom Limited's proposed $117 billion acquisition of Qualcomm Incorporated. The order cited national security concerns regarding 5G technology leadership and semiconductor manufacturing dominance, preventing the consolidation of two major American technology companies. This marked one of the most significant foreign investment blocks of the Trump administration's first term, establishing a precedent for using national security rationales to shape corporate consolidation in the technology sector.

The immediate impact fell on Broadcom and Qualcomm shareholders, employees, and the broader semiconductor supply chain. Broadcom, a Singapore-domiciled but largely U.S.-operated chipmaker, lost the opportunity to acquire Qualcomm's substantial patent portfolio and market position. Qualcomm retained its independence, allowing it to maintain separate operations and strategic direction. Beyond the two corporations, the decision affected semiconductor suppliers, customers in the telecommunications industry preparing for 5G deployment, and American workers in both companies' domestic operations.

This action reflected the Trump administration's broader approach to trade and industrial policy that would characterize its later economic strategies. The rationale for blocking the merger on national security grounds aligned with subsequent patterns of using emergency authorities and security arguments to intervene in economic matters, including the continuation of national emergency declarations on trade deficits extended through 2026. The semiconductor industry consolidation block established that administration policy would prioritize perceived competitive positioning in emerging technologies over allowing market-driven mergers, a framework that carried forward into subsequent trade and technology policies.

The order faced no successful legal challenge and effectively terminated the proposed acquisition. Qualcomm subsequently pursued alternative strategic partnerships and maintained operations as an independent entity, though the broader question of whether national security rationales had been appropriately applied to a commercial technology transaction remained debated among legal scholars and policy analysts.