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 on treaty ratification. The Organization for Security and Cooperation in Europe is based on executive agreements. An executive agreement is an agreement between heads of government of two or more nations that has not been ratified by the legislature, since the treaties are ratified. Executive agreements are considered politically binding to distinguish them from legally binding contracts. With the exception of William Henry Harrison, all presidents, since George Washington 1789, have given orders generally called executives. At first, they did not take a definite form and therefore varied in form and substance.  An executive order is a means of adopting federal directives in the United States, which are used by the President of the United States, who manages federal government operations.  The legal or constitutional basis for executive orders has several sources.
Article 2 of the U.S. Constitution gives the president broad executive and enforcement powers to determine how to enforce the law or to manage executive resources and personnel by other means. The ability to issue such orders is also based on explicit or tacit laws of Congress, which give the President some discretion (delegated legislation).  Controversy surrounds the president`s legal authority to enter into executive agreements. The practice of the president`s unilateral agreements with foreign nations is contrary to the constitutional emphasis placed on joint decision-making and the Framer`s understanding of the scope and extent of contractual power, which Hamilton wrote in a letter under the pseudonym “Camillus” as “competent for all requirements that might require the requirements of national affairs; responsible for the establishment of alliances, trade agreements, peace agreements and any other type of conventions that are common among nations…. And that`s why it was kept with so much care. the collaboration of two-thirds of the Senate with the speaker, who have an obligation to make any contract, whatever. The constitutional text does not mention executive agreements. Moreover, there was no indication of this in the Constitutional Convention or in the national conventions of Animal Ratifir. On this subject, too, federalist documents are silent.
There is therefore no support in the architecture of the Constitution for the use of executive agreements. But their use has flourished; Presidents claim an independent constitutional power to do so, and the judiciary has upheld such claims of authority on the part of the president. The question of constitutional authority, which gives presidents a unilateral ability to sign executive agreements, must be distinguished from what would be called legislative and executive agreements that Congress has authorized and which are generally unspo controversial, if only because they are more constitutionally desirable than unilateral agreements.