Mr Dershowitz has written and informative and thoughtful piece. I am glad that justices in the United States are standing up to poorly written and worse thought out executive orders. Trump has to realize that he isn't the CEO of the United States but the president of a democracy. As such, he is bound by due process and the constitution.
I am no admirer of Trump as either a businessman or a politician. Self-centred bullies aren't my idea of great leaders. But Dershowitz is putting his presidency in perspective. It's a nice counterpoint to the hysterical bleatings of people like Sarah Kendzior, http://www.theglobeandmail.com/opinion/our-anti-american-president/article33678942/, who implies that Trump is ushering in an era of fascism.
While he may have far right leanings, it would take a constitutional amendment to unleash the doomsday scenario she and others of her ilk are predicting. Such an amendment would never pass.