Final answer:
The president's power to enter into agreements with foreign leaders is an example of an Executive Agreement. This power allows presidents to bypass the Senate approval required for treaties and act swiftly in foreign policy, such as with NAFTA or during the Vietnam War.
Step-by-step explanation:
Presidential Power in International Agreements
The power of the president to enter into agreements with foreign leaders or governments is an example of an Executive Agreement. Unlike treaties, which require a two-thirds vote in the Senate for ratification, executive agreements are made by the president directly with the heads of foreign governments. These agreements do not require Senate approval and can be enacted as long as they do not conflict with existing U.S. laws. This method is often used to maneuver around the lengthy and complex treaty process, which can be difficult to navigate, especially with the modern demands of international relations.
Historically, presidents have used this power to effectively engage in foreign policy without the immediate need for congressional approval. Examples of executive agreements include times during the Vietnam War and the North American Free Trade Agreement (NAFTA). Such agreements allow the president to act unilaterally in foreign policy to efficiently respond to international issues.