I have american-iranian relatives who emigrated to the US in the 1980s, they have been protesting at the airport and although they have citizenship, they are worried that Trump's actions are validating and legitimising racism, it's the message it gives to the population and the knock on effect that is a concern not just the immediate impact on those trying to enter/re enter the UK.
As my dad is from Iran, UK resident but not citizen despite living in this country over 50 years and about the least likely person to become a terrorist you can imagine, it's looking like he won't be able to go and visit his family in the US for a while (he usually goes there on holiday most years)
However this is peanuts compared to those with lives in the UK separated from partners or family because they were unlucky enough to be on a holiday or business trip when this all unfolded.
I actually feel a little bit sorry for Theresa the Appeaser, she must have thought she had a really good day with The Orange One on Thursday and now she's shafted herself for not speaking out against him sooner... he kept that one from her didn't he.
Sad, sad day for anyone with a sense of morality and fairness.