On September 19, 2018, the Trump administration issued a formal notice continuing an existing national emergency declaration regarding persons who commit, threaten to commit, or support terrorism. This continuation invoked the International Emergency Economic Powers Act, a statute that grants the president extraordinary authority to regulate financial transactions and impose sanctions during declared national emergencies. The notice maintained existing executive powers to designate individuals and entities as terrorists and restrict their financial assets without requiring individual Congressional authorization for each designation.

The practical effect of this continuation extends broadly across American financial and regulatory systems. Banks, investment firms, and financial institutions must comply with Treasury Department designations of terrorist-linked persons and entities, blocking their accounts and transactions. American citizens, businesses, and nonprofits face potential legal liability if they conduct any financial dealings with designated individuals or organizations. Additionally, the declaration preserves the government's ability to freeze assets, impose travel restrictions, and deny entry to the United States based on executive determinations of terrorist connections, with limited judicial review mechanisms available to those affected.

This action fits within a broader pattern of executive expansion of emergency powers in foreign policy. The related continuation of the Iran national emergency declaration from March 2026 demonstrates how these emergency designations persist and compound over time, creating enduring restrictions on American commerce and travel. Similarly, the fast-tracked arms deals to Middle Eastern partners and the Iran maritime blockade deployment reflect how terrorism-related emergency authorities often intertwine with broader military and sanctions strategies that bypass standard Congressional oversight procedures. Each continuation of these emergency declarations effectively renews executive power without requiring Congressional reauthorization, allowing the administration to maintain unilateral control over designations and enforcement mechanisms.

The legal status of these emergency declarations remains largely uncontested in courts, as litigation challenging terrorist designations typically focuses on individual designation decisions rather than the underlying emergency authority itself. Reversal would require either Congressional action to terminate the emergency declaration or a change in administration policy regarding continuation notices. More substantive reform would necessitate Congressional legislation restricting the scope of executive designation authority or requiring periodic reauthorization with heightened evidentiary standards.