Rep. Seth Moulton Seth MoultonThe Hill's Morning Report - Presented by Facebook - Markey defeats Kennedy; Trump lauds America's enforcers in Wisconsin Moulton fends off primary challenges in Massachusetts Portland: The Pentagon should step up or pipe down MORE (D-Mass.) said Sunday that fellow 2020 presidential hopeful Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE should apologize to Anita Hill Anita Faye HillAnita Hill says she'll vote for Biden Biden set to accept nomination in convention-closing address 50 years covering Biden MORE for how she was treated during her 1991 testimony about Justice Clarence Thomas.

"I do, I think she was treated terribly," Moulton, who launched his 2020 campaign earlier this month, said on CNN's "State of the Union."

"Joe Biden is a mentor and a friend of mine, he's a great American, everybody makes mistakes, I do think that was a mistake though and I think he should apologize."

2020 candidate Rep. Seth Moulton on former Vice President Joe Biden’s handling of the Anita Hill hearing: “Everybody makes mistakes. I do think that was a mistake though and I think he should apologize.” #CNNSOTU pic.twitter.com/RN8WWbbkhL — State of the Union (@CNNSotu) April 28, 2019

The former vice president reached out to Hill before formally announcing his presidential campaign on Thursday.

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He expressed regret for how she was treated during her 1991 testimony, when she accused then-Supreme Court nominee Thomas of sexual harassment in front a committee which Biden chaired.

Hill rejected Biden’s apology, saying she is not convinced that he truly accepts responsibility for the matter.

“I cannot be satisfied by simply saying I’m sorry for what happened to you,” Hill told The New York Times. “I will be satisfied when I know there is real change and real accountability and real purpose.”