The power that the Congress has to provide oversight over the executive and judicial branches refers to
Its implied rights.
Congress can supervise the functioning of the executive and impeach the judges for the foul use of their powers.
Explanation:
The United States Congress has been enabled by the Constitution to supervise the activities of both the executive and the judiciary in order to have impartial and unbiased governance.
Congress has the power to dismiss executives and impeach the judges if they are found not performing the duties as directed by the Constitution.