Answer: Checks and balances
Explanation: Checks and balances can simply be defined as a system which is used to maintain equilibrium level of power such that one branch does not wielding too much power or act out of phase. Checks and balances is a system which allows each branch of government or power to amend, modify, checkmate or veto the decisions or actions of the other branches so that individual branches will be prevented from exerting or wielding too much power.
The president can veto the acts made by the legislative and presidential appointments need the senate approval. The judiciary can also review actions of both the executive and the congress.