It sounds like you're describing the balance of power in the U.S. government, particularly how the Senate plays a critical role in ratifying treaties. Indeed, the Constitution grants the President the authority to negotiate treaties, but those treaties must be ratified by a two-thirds majority in the Senate. This check is a vital component of the checks and balances system designed to prevent any one branch of government from wielding too much power.
To illustrate this relationship in a diagram, you can visualize an arrow going from the President to the Senate, indicating that the President negotiates treaties and submits them for Senate approval. An arrow pointing from the Senate back to the President can depict the Senate's power to either approve or reject those treaties. This interaction emphasizes the collaborative nature of foreign policy-making and the Senate's influential role in shaping U.S. relations with other countries.
If you need specific visual references or further explanations, feel free to ask!