In North Korea: Legislative Basis for U.S. Economic Sanctions (Jan. 14, 2016, R41438) Dianne E. Rennack writes
The U.S. economic sanctions imposed on North Korea exemplify both the independent and intertwined aspects of the relationship between the legislative and executive branches. Congress defers the broadest power to the President, in the National Emergencies Act and the International Emergency Economic Powers Act, to curtail trade and transactions between the United States and North Korea. Congress authorizes the President to fine-tune the relationship with North Korea for foreign policy and national security reasons with each waiver authority it incorporates into legislation. At the same time, Congress closely influences the President’s choices by enacting issue-driven legislation—addressing human rights matters or proliferation concerns, for example—and by adopting North Korea-specific statutes—most particularly the North Korean Human Rights Act of 2004 (P.L. 108-333), the North Korean Human Rights Reauthorization Act of 2008 (P.L. 110-346), and the inclusion of North Korea into the Iran, North Korea, and Syria Nonproliferation Act of 2000 (P.L. 106-178).