the executive order violate a later law that congress passes that you cannot discriminate based on country of origin? we don't know, but they will fight. >> reporter: a lot of unanswered questions at this point. thank you so much, esther. we'll send it back to you, alex. we'll be live throughout the day following the protests. overseas to iran, one of these seven nations banning entry to the united states. nbc's ali arouzi is in iran with a good day to you. the government's response was pretty swift. what are officials saying? >> reporter: indeed, alex. the foreign ministry himself, the foreign minister himself strongly -- the ban, imposing a ban on muslims is a clear insult to the islamic world. tehran says it would take