Conversation so far:
who has to ratify a treaty made by the president
The Constitution provides that the president shall have Power, by and with the Advice and Consent of the Senate, to make Treaties, provided two-thirds of the Senators present concur.“
what part of the constitution says that the president can make treaties
The Treaty Clause is part of Article II, Section 2, Clause 2 of the United States Constitution.
does the constitution say anything about international policy
The U.S. Constitution gives much of the foreign policy decision-making to the presidency.

Question: what kind of decisions
Self-contained rewrite: what kind of foreign policy decisions does the president make