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Trump Fires Back, Calls Rubio "A Baby"

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MIAMI (CBSMiami/AP) – A day after being called "touchy and insecure" by Marco Rubio, Donald Trump fired back calling his GOP competitor "a baby."

The budding rivalry, between two men with South Florida ties, has been a back-and-forth battle of insults.

Trump first hurled an insincere message on Wednesday while campaigning in South Carolina. Trump called Rubio a "lightweight" and criticized his lack of foreign policy experience.

Though, Rubio flipped the script on the foreign policy issue.

"He can't have a conversation about policy because, quite frankly, he doesn't know anything about policy," Rubio said Thursday during an interview on Fox News program "The O'Reilly Factor."

Rubio asserted that Trump's "foreign policy apparently is a secret he can't tell us because he doesn't want to reveal it to the enemy."

Rubio also called the billionaire businessman "touchy and insecure," joining the chorus of Trump critics who have intensified pressure on the GOP front-runner in recent weeks. He added that the real estate mogul relies on attacking people.

"He had a really bad debate performance last week. 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," Rubio said. "I think he's kind of been exposed a little bit over the last seven days and he's a touchy and insecure guy. So that's how he reacts and people can see through it."

Trump took to Twitter on Friday, saying Rubio "is weak on illegal immigration and will allow anyone into the country."

He also added that Rubio "has worst attendance record in Senate- rarely there to vote on a bill!"

Trump shared the same sentiment during the GOP debate.

"You have to understand, I am not sitting in the United States Senate with, by the way, the worst voting record there is today," Trump said, referring to Rubio's missed votes. "Number one, I am not sitting in the United States Senate. I am a businessman doing business transactions."

Rubio countered saying it was because he was focusing on something bigger, The White House.

For more on Campaign 2016, click here.

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