Story highlights Romney told CNN he would not be a candidate at a contested convention

Former GOP nominee says Trump's current comments worse than birther activities

(CNN) Mitt Romney, who came out this week swinging at GOP front-runner Donald Trump, admitted Friday that Trump is the "likely" nominee -- but also hinted strongly that a contested convention is "a realistic scenario" that Republicans need to consider.

But Romney dismissed the suggestion that he is positioning himself to enter the ring.

"That's not going to happen," he told CNN's Chief Political Analyst Gloria Borger. "What's going to happen in a contested convention is that people who are running for president and who have delegates are going to be able to battle with one another."

Even so, when pressed on whether he would allow himself to be nominated at an open convention, he sidestepped a complete answer.

"I'm not going to even go there," Romney said. "I have no interest in talking about that."

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