What Does Executive Agreement Means
Executive agreements are often used to circumvent the requirements of national constitutions for treaty ratification. Many nations that are republics with written constitutions have constitutional rules for ratifying treaties. The Organization for Security and Cooperation in Europe is based on executive agreements. In the United States, executive agreements are concluded exclusively by the President of the United States. They are one of three mechanisms through which the United States enters into binding international commitments. Some authors consider executive treaties to be international treaties because they bind both the United States and another sovereign state. However, under U.S. constitutional law, executive agreements are not considered treaties within the meaning of the treaty clause of the U.S. Constitution, which requires the Council and the approval of two-thirds of the Senate to be considered a treaty. Note: An executive agreement does not have the same weight as a treaty unless it is supported by a joint resolution. Unlike a treaty, an executive agreement can replace a conflicting state law, but not a federal law. The Case Zablocki Act of 1972 requires the president to notify the Senate of any executive agreement within 60 days. The Powers of the President to conclude such agreements have not been divided.
The notification requirement allowed Congress to vote to cancel an executive agreement or refuse to fund its implementation.   The proposed Iran nuclear deal is conventionally an executive agreement and does not need to be a treaty with Senate advice and approval, but Congress should be able to do so because the sanctions ordered by Congress would have to be lifted. In the United States, executive agreements are internationally binding when negotiated and concluded under the authority of the president in foreign policy, as commander-in-chief of the armed forces, or based on an earlier act of Congress. For example, as Commander-in-Chief, the President negotiates and enters into Status of Forces Agreements (SOFIA) that govern the treatment and disposition of the United States.