Final answer:
3. Both the House and the Senate are influential in foreign affairs due to their constitutional roles and committee proceedings.
Step-by-step explanation:
In terms of influence in foreign affairs, 3. both the House and the Senate play important roles. The House of Representatives has the power to approve or reject treaties and appointments made by the President, while the Senate has the authority to ratify treaties and confirm important appointments, such as ambassadors and secretaries of state.
Additionally, the relevant committees in the House and the Senate, such as the Foreign Affairs Committee and the Committee on Foreign Relations, hold regular hearings, consider budget authorizations, and debate U.S. foreign policy.