NPR resurfaced a 1975 interview with then-Sen. 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 (D-Del.) in which he voiced support for a constitutional amendment to end court-ordered busing of black students to predominantly white schools.

“That would clearly do it. We are trying to figure out whether or not we can come up with an innovative piece of legislation which would limit the remedy and I honestly don't know whether we can come up with something constitutional,” Biden said when asked about an amendment. “I'm going to go at it through a constitutional amendment if it can't be done through a piece of legislation.

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Biden suggested at the time that liberals were having a knee-jerk reaction to supporting busing as a method of school integration simply because racists were against it.

"I think that part of the reason why much of this has not developed, much of the change has not developed, is because it has been an issue that has been in the hands of the racist," Biden said, "and we liberals have out-of-hand rejected it because, if George Wallace is for it, it must be bad. And so we haven't really looked at it. Now there's a confluence of streams. There is academic ferment against it — not majority, but academic ferment against it. There are young blacks and young white leaders against it."

The Biden campaign did not immediately respond to a request for comment from The Hill regarding the resurfaced comments.

The 1975 interview’s resurfacing comes a day after Biden clashed with 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.) at their first presidential primary debate for his past comments on busing and remarks about working with two segregationist senators while he was in Congress.

“I do not believe you are a racist and I agree with you when you commit yourself to the importance of finding common ground,” Harris told Biden Thursday night. “But I also believe, and it’s personal and I was actually very — it was hurtful to hear you talk about the reputations of two United States senators who built their reputations and career on the segregation of race in this country.”

“On this subject, it cannot be an intellectual debate among Democrats, we have to take it seriously, we have to act swiftly,” she added before discussing busing.

Biden defended himself Friday during a speech in Chicago on Friday, saying that “I fought my heart out to ensure that civil rights and voting rights, equal rights are enforced everywhere” and that he “never, ever opposed voluntary busing.”