The theory of the Imperilled Presidency was created by former President of the United States Gerald Ford in contrast to Schlesinger's theory of the Imperial Presidency. The theory suggests that rather than being too powerful, the President does not have enough power to be effective.
[A] principal weakness in the presidency is the inability of the White House to maintain control over the large federal bureaucracy. There is nothing more frustrating for a President than to issue an order to a Cabinet officer, and then find that, when the order gets out in the field, it is totally mutilated.
Since the passing of the War Powers Act in 1973, Presidents have had less control over where they can fight a war. Although technically the President is Commander in Chief of the Armed forces, this act seriously limited his control over foreign policy, where the President always had the most power.