Arthur Caplan

Dr. Arthur Caplan is a Distinguished Professor of Bioethics at New York University. Caplan argued in  2015 that Trump’s tactics for gaining support was just like Hitler’s! Caplan argued, according to Campus Reform  that Trump’s immigration plan “should be viewed in the repugnant tradition of Hitler.” He told Campus Reform “The greatest danger is that a man willing to use racism to gain political support gets elected and then shapes his policies on poverty, immigration, criminal justice and jobs on the basis of his blatantly and dangerous racist views.” Ironically, Caplan previously criticized people who used the Nazi analogy in bioethics debates.
Source(s): http://www.campusreform.org/?ID=6690
http://www.bioethics.net/2005/07/misusing-the-nazi-analogy/ 
http://www.poynter.org/2015/commentary-the-danger-of-laughing-at-donald-trump/358895/