An executive agreement is an agreement between the heads of government of two or more nations that has not been ratified by the legislature when treaties are ratified. Executive agreements are considered politically binding in order to distinguish them from legally binding treaties. The Case Zablocki Act of 1972 requires the president to inform the Senate of any executive agreement within 60 days. The powers of the President to enter into such agreements have not been granted. The notification requirement allowed Congress to vote in favor of cancelling an executive agreement or to refuse to fund its implementation.   The use of executive agreements increased considerably after 1939. In the United States, executive agreements are binding internationally when negotiated and concluded under the authority of the president on foreign policy, commander-in-chief of the armed forces, or a previous act of Congress. For example, the president, as commander-in-chief, negotiates and enters into status of forces agreements (SOFAs) governing the treatment and disposition of U.S. armed forces stationed in other nations. However, the President may not unilaterally conclude executive agreements on matters not within his constitutional authority. In such cases, an agreement should take the form of an agreement between Congress and the executive or a contract with deliberation and approval by the Senate.  The U.S. Constitution does not explicitly empower a president to enter into executive agreements.
However, it may be authorized to do so by Congress or it may do so on the basis of the power to manage foreign relations granted to it. Despite the question of the constitutionality of executive agreements, the Supreme Court ruled in 1937 that they have the same force as treaties. As executive agreements are concluded on the authority of the President-in-Office, they do not necessarily bind his successors. Most executive agreements were made on the basis of a treaty or an act of Congress. However, presidents have sometimes entered into executive agreements to achieve goals that would not have the support of two-thirds of the Senate. For example, President Franklin D acted. After the start of World War II, but before the United States entered the conflict, Roosevelt struck an executive agreement that granted the United Kingdom 50 overflow destroyers in exchange for 99 years of leases for some British naval bases in the Atlantic. . . .