Final answer:
Impeachment serves as a check on the president's power by providing a clear process for removing a president from office if they are charged with serious wrongdoing.
Step-by-step explanation:
Impeachment serves as a check on the president's power by providing a clear process for removing a president from office if they are charged with serious wrongdoing. The process involves two stages, with the House of Representatives voting to impeach the president by a simple majority and the Senate conducting a trial to remove the president from office by a two-thirds majority vote. If the president is convicted and removed, the vice president takes over as the new president.