Washington (CNN) Sen. Elizabeth Warren ripped Sen. Amy Klobuchar's health care plan during Wednesday night's Democratic presidential debate as "like a Post-it Note" amid a forceful confrontation over her primary rival's approach to the cornerstone campaign issue.

"We need to get everybody's health care plan out here," the Massachusetts Democrat said before pointedly calling Klobuchar's plan "like a Post-it Note -- insert plan here."

Klobuchar shot back, laughing, that she took personal offense at the jab "since Post-it Notes were invented in my state" before launching into a larger rebuke of "Medicare for All."

"The truth is that when you see some troubled waters, you don't blow up a bridge, you build one," the Minnesota Democrat said. "And so we need to improve the Affordable Care Act, not blow it up."

The exchange laid bare the enduring division within the primary over Medicare for All , a plan backed by Warren and Sen. Bernie Sanders of Vermont that would enroll Americans in a government-run program with no premiums or out-of-pocket charges.

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