Washington (CNN) – Former Republican presidential nominee Mitt Romney said Sunday that the botched rollout of the federal health exchange not only proves the President "failed to learn the lessons that came from the experience in Massachusetts," but also threatens to derail the credibility of his entire second term agenda.

"The fact that the president sold it on a basis that was not true has undermined the foundation of his second term. I think it's rotting away," Romney told David Gregory on NBC's "Meet the Press."

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