Final answer:
In the U.S., treaties are negotiated by the President and require 2/3 approval from the Senate for ratification. The process is outlined in Article II of the U.S. Constitution.
Step-by-step explanation:
In the U.S., treaties are negotiated by the President and require 2/3 approval from the Senate. This process, as dictated by the U.S. Constitution in Article II, involves the President negotiating treaties, followed by the Senate consenting to them with a two-thirds vote, after which the President can ratify the treaty.
While the President also has the power to form executive agreements, these do not hold the same status as treaties and often do not require the same level of Senate involvement unless they involve appropriations or changes to federal law.