The Ban should be permanent as the 6 countries it covers are run by war lords and terrorist sympathizing regimes. I would also add Iraq, Saudi Arabia, Jordan, Turkey, Afghanistan, The Chechnya region,  Pakistan, Algeria, Tunisia and Morocco as those countries /regions have all sent citizens to kill civilians in the United States and Western Europe in recent years. Libyans were responsible for the attack in Manchester, Morrocoans for recent attacks in Spain, Finland, France and Belgium. Tunisians for attacks in France and Germany, Afghans for attacks and mass sexual violence in Germany, France, Austria and The United States. Saudis and Pakistanis for attacks in the USA. Jordanians ( USA), Chechens in the USA. Turks in the USA and Germany. Somalis in the  USA. Iranians ( germany) The list goes on and on.