Donald Trump has signed an executive order that could make him the most powerful president in history by using an obscure Constitutional theory to enact his vision of presidential authority. The new order seeks to 'reign in independent agencies' by seizing various departments that normally act in accordance with Congress and bring them under control of the executive branch in the White House. The order also states that the president and attorney general will interpret the law, leaving Trump free from Congressional and judicial oversight. Observers suggest that Trump is using unitary executive theory which grants the president a wide...