On January 10, 2020, President Trump signed Executive Order 13902, imposing additional sanctions on Iranian economic sectors beyond those already restricted under prior sanctions regimes. The order expanded the scope of existing restrictions to target new industries within Iran's economy, effectively broadening the definition of prohibited transactions for American persons and entities. The legal mechanism employed the executive's authority under the International Emergency Economic Powers Act, allowing the administration to unilaterally designate sectors and restrict U.S. involvement without requiring congressional approval for each new addition.

The direct impact fell on American companies, financial institutions, and individual traders who previously operated in or contemplated entering Iranian markets in the newly sanctioned sectors. U.S. persons face criminal and civil penalties for conducting business with designated Iranian industries, including potential violations carrying prison time and substantial fines. Financial institutions must implement compliance systems to detect and prevent transactions touching these sectors, creating operational costs and legal exposure. The order effectively foreclosed legitimate commercial pathways and created uncertainty about which Iranian sectors might next be designated.

This executive order formed part of an escalating sanctions architecture that the Trump administration maintained and expanded throughout its tenure and beyond. The continuation of the national emergency declaration regarding Iran in March 2026 preserved these sanctions authorities, while subsequent military actions—including the 2026 deployment of additional naval and marine forces to enforce a maritime blockade and the withdrawal of 5,000 troops from Germany ostensibly to pressure European allies on Iran policy—demonstrated an intensifying commitment to economic and military pressure against Iran. The arms deals fast-tracked to Persian Gulf partners in May 2026 functioned as complementary instruments to the sanctions regime, arming regional actors while simultaneously restricting Iranian economic capacity.

No major legal challenges blocked implementation of Executive Order 13902 itself, though broader litigation has questioned the legal basis for the national emergency declaration underlying the sanctions regime. Congressional responses remained limited, reflecting divided legislative authority over foreign sanctions policy. A potential reversal would require either a new executive order rescinding 13902 or legislative action terminating the Iran national emergency declaration, either of which could restore commercial access to previously sanctioned Iranian sectors.