Where do presidents get their power to make executive agreements?

Presidents derive their power to make executive agreements from the U.S. Constitution, particularly from the presidential authority to conduct foreign affairs. While Article II, Section 2 grants the president the power to make treaties with the advice and consent of the Senate, executive agreements can be made unilaterally without Senate approval, as they are considered a tool for managing international relations. This practice has been upheld by historical precedent and judicial interpretation, allowing presidents to act swiftly in foreign matters.