Many universities have been facing controversies because they have been asked to provide a speaking platform for alleged quot;white...

Many universities have been facing controversies because they have been asked to provide a speaking platform for alleged "white supremacist" speakers. For example, Professor Luigi Zingales recently invited former White House chief strategists Steve Bannon to speak on the campus of the University of Chicago. Many faculty and student organizations have erupted in anger as a result, and have demanded that the university not give Bannon a platform.

See: 

http://www.washingtonexaminer.com/university-of-chicago-students-faculty-protest-potential-campus-visit-from-white-supremacist-steve-bannon/article/2647418

http://www.newsweek.com/university-chicago-alumni-protest-steve-bannon-visit-796425

Also read this statement from the ACLU:

https://www.aclu.org/other/speech-campus

If Bannon--or someone like Bannon--were to be asked to speak at University, what do you think the appropriate response should be?

Please reference specific legal principles and precedents.