South Bend, Indiana Mayor Pete Buttigieg went after Sen. Elizabeth Warren on Tuesday over her health care proposal, and said Wednesday morning she’s been more specific about the number of selfies she’s taken with voters than the cost of “Medicare for All.”

Asked why it matters whether taxes go up if costs go down, Buttigieg responded, “Not only is it important to have yes-or-no answers to yes-or-no questions at a time when people are so frustrated with Washington speak, but also there’s still been no explanation for a multi-trillion dollar hole in this plan.

“I have a lot of respect for Sen. Warren, but last night, she was more specific and forthcoming about the number of selfies she’s taken than how this plan is going to be funded,” he said.

Fox News explains the debate exchange between Warren and Buttigieg:

After being asked by the moderators early at the fourth-round debate at Otterbein University whether middle-class taxes would rise under her health care proposal, the progressive senator from Massachusetts didn’t specifically answer, instead pledging that “I will not sign a bill into law that does not cut costs for middle-class families.”

Moments later, South Bend, Ind., Mayor Pete Buttigieg took aim at Warren, who’s soared in polling in recent months and is now considered a frontrunner for the party’s presidential nomination alongside former Vice President Joe Biden.

Accusing Warren of being evasive, Buttigieg argued that “your signature, Senator, is to have a plan for everything— except for this. No plan has been laid out to explain how a multitrillion-dollar hole in this Medicare-for-all plan that Senator Warren is putting forward is supposed to get filled in.”

Buttigieg then touted his plan for “Medicare-for-all-who-want it,” which, unlike the Medicare-for-all proposal championed by Warren and Sen. Bernie Sanders of Vermont, would not eliminate private insurance.

Warren, firing back at Buttigieg, said: “Let’s be clear, whenever someone hears the term ‘Medicare for all who want it,’ understand what that means: It’s ‘Medicare for all who can afford it.’ And that’s the problem we’ve got. Medicare-for-all is the gold standard.”

But Mayor Pete counterpunched: “I don’t understand why you believe the only way to deliver affordable coverage to everybody is to obliterate private plans, kicking 150 million Americans off of their insurance in four short years.”

Earlier in the debate, Warren bragged she had recently taken her 70,000th selfie with a fan.