Presidential candidate Marco Rubio is hitting back at Donald Trump, calling him a "touchy and insecure guy" who is not well informed on issues.
"First of all, he takes shots at everybody that gets anywhere close to him, in terms of a poll, or anytime he hits a rough spot, that's what he does," he said during an interview on Kentucky Sports Radio Thursday morning.
"He had a really bad debate performance last week," continued Rubio. "He's not well informed on the issues. He really never talks about issues and can't have more than a 10-second soundbite on any key issue. And I think he's kind of been exposed a little bit over the last seven days, and he's a very touchy and insecure guy and so that's how he reacts, and people can see through it."
Trump slammed Rubio on Wednesday during an appearance in South Carolina, calling him a "lightweight" and poking fun at the Florida senator's perspiration during the second GOP debate last week.
Trump leads a new Quinnipiac poll of the Republican field released Thursday morning, coming in with 25 percent support. Rubio stood in fifth place, with the backing of nine percent of GOP voters.
This story originally appeared on NBCNews.com