Immigration cases are civil rather than criminal proceedings, and aliens have limited due process rights as defined by Congress and Supreme Court precedents. Those rights differ depending on whether aliens are trying to enter this country or are already here, legally or illegally, as well as their visa or other status. Federal immigration statutes bar aliens from asserting certain claims in federal courts, prohibit any federal court from reviewing specified federal government actions such as the Attorney General’s enforcement of deportation orders, and limit which federal courts have jurisdiction over particular alien claims. Federal courts assuming jurisdiction over such banned, prohibited, or limited claims are violating federal law, and the Supreme Court, if necessary, should tell them so.