Columbus, Ohio (CNN) Democratic presidential candidate Pete Buttigieg will begin airing a digital ad on Tuesday that calls out rivals Sens. Elizabeth Warren of Massachusetts and Bernie Sanders of Vermont by name for their support of "Medicare for All."

The ad -- titled "Makes More Sense" -- highlights Buttigieg's Medicare for All Who Want It health care plan, a middle-of-the-road approach that would not force people onto government health coverage but would offer a public option for people who choose to enroll. That is a key distinction between Buttigieg's plan and the sweeping overhaul that would be instituted under a full Medicare for All program.

The ad represents an escalation by the South Bend, Indiana, mayor's campaign, after he's mostly kept his Medicare for All critiques nameless and primarily focused on policy.

Buttigieg's ad uses reporters and media figures to describe the differences between the plans, including CNN political commentator Joe Lockhart saying, "Bernie Sanders and Elizabeth Warren believe that we have to force ourselves into Medicare for all, where private insurance is abolished."

His campaign said in a news release, "The ad highlights Pete's bold approach to health care would not kick millions of people off their private health care, and would give them the option to choose the plan that's right for their them."

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