Hawaii Congresswoman Tulsi Gabbard sharpened her attacks against California Sen. Kamala Harris during Wednesday’s Democratic presidential debate, painting her health care policy as a giveaway to the private insurance industry and skewering the former prosecutor and attorney general’s record on criminal justice. Gabbard went so far as to tell Harris that she should apologize to “the people who suffered under your reign.”

Harris’ criminal justice record is seen as her biggest weakness among the progressive wing of the Democratic Party.

“Now, Senator Harris says she’s proud of her record as a prosecutor and that she’ll be a prosecutor president. But I’m deeply concerned about this record,” said Gabbard. “There are too many examples to cite but she put over 1,500 people in jail for marijuana violations and then laughed about it when she was asked if she ever smoked marijuana.

“She blocked evidence that would have freed an innocent man from death row until the courts forced her to do so. She kept people in prison beyond their sentences to use them as cheap labor for the state of California, and she fought to keep a cash bail system in place that impacts poor people in the worst kind of way.”

Harris defended her record, noting that she was in favor of legalizing marijuana and had been personally opposed to the death penalty throughout her career.

“As the elected attorney general of California, I did the work of significantly reforming the criminal justice system of a state of 40 million people, which became a national model for the work that needs to be done,” said Harris. “And I am proud of that work. And I am proud of making a decision to not just give fancy speeches or be in a legislative body and give speeches on the floor but actually doing the work, of being in the position to use the power that I had to reform a system that is badly in need of reform.”

Gabbard also went after Harris on health care. Harris has favored Medicare for All, but her health care proposal released in recent days carves out a role for private insurers.

While Harris pointed out during the debate that her plan had been endorsed by Kathleen Sebelius, who led the Department of Health and Human Services under former President Barack Obama, Gabbard said that wasn’t a good thing. Sibelius is on the board of private insurer, Devoted Health, which sells Medicare Advantage plans.

Gabbard said Sebelius helped write Harris’ proposal, calling it a “fatal flaw.”

“Sebelius works for Medicare Advantage, a private insurance company that will stand to profit under her plan,” said Gabbard. “If we are seeking to really reform our health care system we have got to shut big insurance and big pharma out of the drafting process so they cannot continue to profit off the backs of the sick people in this country, searching and in desperate need of care.”

Harris shot back that Gabbard “got it wrong,” saying Sebelius did not write her plan, rather she endorsed it as one of the best plans to achieving universal health care coverage.

Harris is among the frontrunners in the presidential race, but she’s trailed behind former Vice President Joe Biden who took the brunt of the attacks during Wednesday’s debate.

Gabbard has taken shots at Harris throughout the campaign.

Shortly before Gabbard announced her run for the presidency in January, she penned a scathing op-ed in The Hill in which she suggested Harris and other Democratic colleagues were fomenting religious bigotry by probing a Trump judicial nominee’s membership in the Knights of Columbus, a Catholic fraternal society.

Gabbard also accused Harris of trying to “score cheap political points” in criticizing former Vice President Joe Biden’s civil rights record. More recently, she accused Harris of lacking the experience and temperament to be commander-in-chief.

Melissa Michelson, a political science professor at Menlo College in California, said on the eve of Wednesday’s debate that Gabbard may be attacking Harris because she’s hoping to be picked as vice president.

“It is possible that Tulsi Gabbard is trying to position herself to be that vice presidential candidate, so she then does see Kamala Harris as her logical target of attacks because that is who she is trying to take down — this other person who is mentioned quite frequently as a strong contender for vice.”

Colin Moore, director of the public policy center at the University of Hawaii at Manoa, said he thought Gabbard’s attack on Harris’ criminal justice record was effective. It quickly attracted headlines and gave her airtime.

He said the problem for Gabbard was that the debate focused on domestic issues, not foreign policy which is Gabbard’s strong suit. He noted Gabbard seemed less sure of herself when discussing domestic topics at times looking down at her notes.

Still, he said Gabbard “did as well as she probably could have done” and she may make the critical September debates when the field of candidates is expected to shrink significantly.

“She is right on the edge,” said Moore.

Google Trends indicated after the debate that Gabbard was the most searched Democratic candidate, with Harris as No. 2.