"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 SandersBernard (Bernie) SandersMellman: On Political Authenticity (Part 2) Former Sanders campaign manager: Don't expect email list to be shared with DNC Adult film star: Trump and Stormy Daniels invited me to 'hang out' 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 John TrumpDems flip Wisconsin state Senate seat Sessions: 'We should be like Canada' in how we take in immigrants GOP rep: 'Sheet metal and garbage' everywhere in Haiti 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.