What is due process of law? The right to due process of law is a core protection around which the founders of our nation built our system of government. Due process of law is a check against arbitrary government action. Today our government is systematically depriving the population of immigrants living here illegally of life, liberty and property without the due process of law to which they are entitled. Why denial of due process to unauthorized immigrants mattersDue process of law is under siege in America, and when due process of law is under siege, democracy is under siege; government accountability declines and personal liberties erode.