Just a few that come to mind
"When Mexico sends its people, they're not sending their best. They're not sending you. They're not sending you. They're sending people that have lots of problems, and they're bringing those problems with us. They're bringing drugs. They're bringing crime. They're rapists. And some, I assume, are good people." [0]
"26,000 unreported sexual assults in the military-only 238 convictions. What did these geniuses expect when they put men & women together?" [1]
"Donald J. Trump is calling for a total and complete shutdown of Muslims entering the United States until our country's representatives can figure out what is going on" [2]
Considering that this last one would be considered hate speech and banned on Facebook if it were not made by a major US politician [3], I think openly supporting the candidate and going out of your way to help his campaign is fair game for criticism
[0] http://www.newsday.com/news/nation/donald-trump-speech-debat...
[1] https://twitter.com/realdonaldtrump/status/33190738377114828...
[2] http://www.amny.com/news/elections/donald-trump-s-memorable-...
[3] http://www.wsj.com/articles/facebook-employees-pushed-to-rem...