Marco RubioMarco Antonio RubioChina's TikTok turns to former lawmakers to help with content moderation policies Hillicon Valley: Warren turns up heat in battle with Facebook | Instagram unveils new data privacy feature | Advocacy group seeks funding to write about Big Tech TikTok adds former lawmakers to help develop content moderation policies MORE on Thursday rebuffed a supporter who called Democratic presidential rival Hillary ClintonHillary Diane Rodham ClintonGOP warns Graham letter to Pelosi on impeachment could 'backfire' Hillary Clinton praises former administration officials who testified before House as 'gutsy women' Third-quarter fundraising sets Sanders, Warren, Buttigieg apart MORE a "traitor," though he criticized her politics and use of a private email server while secretary of State.
 
"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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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.
 
 
Rubio is battling Trump and Ted CruzRafael (Ted) Edward CruzThe Hill's Morning Report - Dem debate contenders take aim at Warren The Hill's Morning Report - Trump grapples with Turkey controversy This week: Congress returns to chaotic Washington MORE in South Carolina and is campaigning with the state's Gov. Nikki Haley, who endorsed the Florida senator on Wednesday.