I used to go to the USA two or three times a year to visit relatives and for a holiday, spending thousands each time on a hotel, car hire, subsistence, gifts etc.
I started to cut down after "9/11" because getting into the country made me feel like a criminal, even though I am middle class white european male to the 4th generaion with a UK passport etc.
I've not been in three years now, and I estimate it's cost their economy over $15000... and counting.
I know there are many others like me. I've heard of Chinese companies trying to send people to do trade deals being turned away, and spending millions in Europe instead as they are welcomed with open arms.
Surely His Highness Donald and all his business owning buddies would want the tourists's money rather than turning them away in droves?