Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) apologized to former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE Sunday night after an op-ed by a Sanders campaign surrogate published in The Guardian accused Biden of corruption.

The Vermont senator told CBS News that he regretted the message published by Sanders surrogate Zephyr Teachout, who does not hold an official role with the campaign but has endorsed and introduced the senator at his rallies.

"It is absolutely not my view that Joe is corrupt in any way. And I'm sorry that that op-ed appeared," Sanders told the news channel.

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His statement follows a Sanders campaign press release that circulated the op-ed to supporters and members of the media with the heading "Joe Biden has a big corruption problem."

The day before the Senate impeachment trial against Trump begins, the Bernie Sanders campaign circulates this op-ed attack on Joe Biden pic.twitter.com/ReEsU2Lkrn — Mark Murray (@mmurraypolitics) January 20, 2020

In the op-ed, Teachout writes that the former vice president has erred by accepting campaign contributions from large donors and special interests, accusing him of embracing a style of politics no longer supported by the American electorate.

"It looks like 'Middle Class' Joe has perfected the art of taking big contributions, then representing his corporate donors at the cost of middle- and working-class Americans. Converting campaign contributions into legislative favors and policy positions isn’t being 'moderate'. It is the kind of transactional politics Americans have come to loathe," she wrote.

"Biden has a big corruption problem and it makes him a weak candidate," added Teachout. "I know it seems crazy, but a lot of the voters we need — independents and people who might stay home — will look at Biden and Trump and say: 'They’re all dirty.' "

Biden later responded on Twitter, writing: "Thanks for acknowledging this, Bernie. These kinds of attacks have no place in this primary. Let’s all keep our focus on making Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE a one-term president."

Thanks for acknowledging this, Bernie. These kinds of attacks have no place in this primary. Let’s all keep our focus on making Donald Trump a one-term president. https://t.co/tmFbLm98xd — Joe Biden (Text Join to 30330) (@JoeBiden) January 21, 2020

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Teachout, a Fordham law professor and a candidate for governor of New York in 2014, endorsed Sanders last month in a video released by his campaign.