Under the Constitution of the United States, who has primary responsibility for the conduct of foreign affairs?

A) The president of the United States
B) The Senate of the United States
C) The secretary of state
D) The Speaker of the House of Representatives

According to Article II, Section 2 of the Constitution, the president of the United States is the chief diplomat and therefore has primary responsibility for the conduct of foreign affairs. While the Senate plays a role in ratifying treaties and confirming ambassadors, the president is ultimately responsible for the foreign policy of the United States. The secretary of state serves as the president's chief advisor on foreign affairs and carries out the president's directives, but does not have primary responsibility under the Constitution. The Speaker of the House of Representatives is a legislative leader and has no formal role in foreign affairs.