"The Democratic Party today has been taken over by radical elements on the left," Rubio said during a campaign event in Greenville, S.C., ahead of Saturday's GOP primary there. 
 
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"When the leading candidate is an avowed democratic socialist, you know the Democratic Party has gone off the deep end," Rubio continued, referencing Bernie SandersBernie SandersA guide to the committees: Senate Ellison holds edge in DNC race Rep. John Lewis: Ellison is 'right person' to lead DNC MORE and Clinton.
 
Rubio discussed the FBI's ongoing investigation into Clinton's email arrangement, before stating, "She did it because she thinks she's above the law. They've always thought they're above the law."
 
"She's a traitor!" a man in the audience yelled, according to CNN.
 
"Well I wouldn't go that far, sir," Rubio said before adding, "But I would say that she is someone who thinks that she is above the law."
 
When the man continued, mentioning Benghazi, Rubio took the opportunity to criticize the former secretary of State for her handling of the 2012 attacks in Libya.
 
Candidates' reaction to incendiary comments from supporters have drawn attention at previous campaign events.
 
GOP front-runner Donald TrumpDonald TrumpPoll: Majority of Americans fear US will become involved in another major war Ellison holds edge in DNC race WH adviser Stephen Miller: 'Nothing wrong' with Trump travel order MORE caught flak in September for failing to correct a supporter at a rally who said that President Obama wasn't a U.S. citizen and was also a Muslim.
 
Rubio is battling Trump and Ted CruzTed CruzA guide to the committees: Senate Trump wants to cut red tape? He should start with the CFPB. Why President Trump should choose Maureen Ohlhausen to lead the FTC MORE in South Carolina and is campaigning with the state's Gov. Nikki Haley, who endorsed the Florida senator on Wednesday.