Question: can the president terminate a treaty without senate approval

Answer: Yes, A sole-executive agreement can only be negotiated and entered into through the president's authority (1) in foreign policy, (2) as commander-in-chief of the armed forces, (3) from a prior act of Congress, or (4) from a prior treaty. Agreements beyond these competencies must have the approval of Congress (for congressional-executive agreements) or the Senate (for treaties).