In Article 2, the Constitution says that the executive branch, headed by the President, has the power to enforce or carry out laws. The judicial branch, headed by the Supreme Court, is established in Article 3 of the Constitution to interpret and apply the laws in court cases that come before it.
The President has the power to veto legislation; Senate approval is required for executive and judicial nominations made by the President; the judiciary has the power to review actions of Congress or the President; and Congress may, through impeachment, remove the President, Vice President, and other "civil Officers of ..