Final answer:
Presidential power is limited by the need for congressional approval for spending (the power of the purse), the requirement for Senate confirmation of key appointments, constraints in foreign policy due to shared powers with Congress, and potential opposition from a Congress controlled by the opposite political party.
Step-by-step explanation:
The limits to presidential power are an important aspect of the checks and balances system embedded in the U.S. Constitution. Congress has the power of the purse, meaning the president cannot spend public money without congressional approval through an appropriations bill. Additionally, the Senate's role is crucial as it must confirm many of the most important presidential appointments, providing a check on the president's executive powers. Furthermore, the president's influence is limited when it comes to dealing with foreign leaders and policies, as certain actions require congressional approval, like the ratification of treaties and the declaration of war. Finally, the political landscape can pose challenges to presidential governance, especially when the president faces a Congress controlled by the opposition party, making legislation and policy advancement more difficult.