Sen. Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing MORE (D-Calif.) on Sunday expanded on her criticism of fellow 2020 White House hopeful Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE’s remarks reminiscing about his working relationship with segregationist former colleagues.

“We cannot be ignorant of the history of race in this country and certainly anyone who is a leader should not be,” Harris said on CBS's "Face the Nation," referring to the former vice president noting that former Sen. James O. Eastland (D-Miss.) had called him “son” rather than “boy.”

“We cannot be ignorant of the history of race in this country, and certainly anyone who is a leader should not be,” @KamalaHarris says of @JoeBiden’s comments about his relationship with segregationists. pic.twitter.com/FG4pfZzZuI — Face The Nation (@FaceTheNation) June 23, 2019

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Harris made clear that she did not take issue with Biden discussing compromise with figures like Eastland and Sen. Herman Talmadge (D-Ga.)

“I applaud any effort to work across party lines around common goals and common interests,” Harris said. “Praising and coddling individuals who made it their life’s work and built their reputations off of segregation of the races, that’s a problem.”

“I would not be member of the United States Senate if those men he praised had their way,” she added.

Biden’s comments at a fundraiser last week prompted harsh criticism from several of his fellow Democratic presidential candidates in a primary whose fire has thus far been aimed at President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE. Sens. Cory Booker Cory Anthony Booker3 reasons why Biden is misreading the politics of court packing Bipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility MORE (D-N.J.) and Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) have also called for Biden to apologize.

“At least there was some civility. We got things done. We didn't agree on much of anything. We got things done. We got it finished,” Biden said of Eastland and Talmadge at the fundraiser.

Biden told MSNBC’s Al Sharpton on Saturday in South Carolina that he understands "the consequence of the word 'boy.'"

"But it wasn't said in any of that context at all," he added.