It's interesting that, in the past, UH has invited liberals like Ward Churchill (who was later fired for academic misconduct) to speak on campus, but I cannot recall it inviting someone with a conservative background to speak.   Universities are supposed to be bastions of free speech where students can be exposed to differing viewpoints and to discuss the merits of those viewpoints.  When only speakers with "approved" viewpoints are invited, then UH is restricting free speech just as much as UC Berkely has.