I don’t think this so great for non us citizens working in the USA because they have to go in and out and can just as well be denied entry. For someone like tha

I don’t think this so great for non us citizens working in the USA because they have to go in and out and can just as well be denied entry. For someone like that who made his life in the USA and has family here, going to conferences outside the USA is potentially much worse and riskier than say a German resident and citizen getting denied travel into the USA for a number of years.