diverdave, it's only your opinion that Trump's executive order is legal and constitutional.  However, legal scholars say that the question may have to be settled by the Supreme Court.  Even some Republicans have stated their opposition to the executive order as being un-American.

Tens of thousands protested Trump's executive order.  Millions protested against Trump on the day after his inauguration.  More will protest his next decision that devastates the environment or restricts the rights of women or builds a wall.  

The United States was born out of a great protest.  Trump will make America great again -- great at protesting.