Separation of Powers: Separation of powers is a fundamental principle in which governmental powers are divided among three branches (executive, legislative, judicial) to prevent any single branch from becoming too powerful.
Impeachment: Impeachment is a process through which an elected official, including presidents, can be charged with misconduct and removed from office if found guilty by Congress for "high crimes and misdemeanors."
Veto Power: Veto power refers to a president's authority to reject legislation passed by Congress. This serves as a check because it requires support from two-thirds of both chambers to override a veto.