It's absolutely correct that USA anti-Muslim immigration policies, and above all their current overzealous enforcement, will stop all kinds of people from visiting or working there--especially anyone likely to be profiled as a potential middle-eastern person/Muslim/critic of the president.
If you don't like the way these women explain it, try this:
http://www.businessinsider.com/american-colleges-sent-letter-to-trump-denouncing-his-immigration-ban-2017-2?op=1
Or this:
https://www.washingtonpost.com/news/worldviews/wp/2017/02/26/u-s-detains-and-nearly-deports-french-jewish-historian/?utm_term=.1d91f4e010e9
And so on . . ..  University people may use a lot of jargon but ultimately, international university values are all about exchange and debate and discovery. Bannonism is about the opposite.