Sanders apologizes to Biden for supporter's attack

CHICAGO — Sen. Bernie Sanders apologized Monday night for an op-ed written by a campaign supporter that argued former Vice President Joe Biden “has a big corruption problem.”

In an interview in Iowa with CBS News, Sanders said “it is absolutely not my view that Joe is corrupt in any way. And I'm sorry that that op-ed appeared."

Biden quickly accepted Sanders' apology, writing in a tweet, "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."

Sanders' vocal speechwriter David Sirota shared the op-ed, written by associate Fordham University law professor Zephyr Teachout, to an email list of supporters Monday morning. The email highlighted that “In one passage, she asks ‘When he pushed for cuts to Social Security, was he (Biden) serving donors or his constituents?’”

The op-ed was the latest in an ongoing clash between Sanders and the former vice president over Social Security, but was another example of Sanders’ supporters and staff taking a more aggressive tone than the candidate himself.

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Democratic debate in Des Moines, Iowa
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Democratic debate in Des Moines, Iowa
(L-R) Democratic presidential hopefuls billionaire-philanthropist Tom Steyer, Massachusetts Senator Elizabeth Warren, Former Vice President Joe Biden, Vermont Senator Bernie Sanders, Mayor of South Bend, Indiana, Pete Buttigieg and Minnesota Senator Amy Klobuchar participate in the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)
Democratic presidential hopefuls Massachusetts Senator Elizabeth Warren (L) and former Vice President Joe Biden participate of the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)
Democratic presidential hopefuls former Vice President Joe Biden (L) and Vermont Senator Bernie Sanders participate of the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)
Democratic presidential hopeful Massachusetts Senator Elizabeth Warren participates of the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)
Democratic presidential hopefuls Massachusetts Senator Elizabeth Warren (L), former Vice President Joe Biden (C) and Vermont Senator Bernie Sanders participate of the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)
Democratic presidential hopeful Massachusetts Senator Elizabeth Warren (L) chats with Vermont Senator Bernie Sanders (L) alongside billionaire-philanthropist Tom Steyer (C) during a break of the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)
Democratic presidential hopefuls Massachusetts Senator Elizabeth Warren (L), former Vice President Joe Biden (C) and Vermont Senator Bernie Sanders participate of the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)
Democratic presidential hopeful Minnesota Senator Amy Klobuchar speaks during the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)
Democratic presidential hopeful billionaire-philanthropist Tom Steyer speaks during the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)
Democratic presidential hopeful Massachusetts Senator Elizabeth Warren participates of the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)
DES MOINES, IOWA - JANUARY 14: Tom Steyer, Sen. Elizabeth Warren (D-MA) and Former Vice President Joe Biden interact after the Democratic presidential primary debate at Drake University on January 14, 2020 in Des Moines, Iowa. Six candidates out of the field qualified for the first Democratic presidential primary debate of 2020, hosted by CNN and the Des Moines Register. (Photo by Scott Olson/Getty Images)
DES MOINES, IOWA - JANUARY 14: Sen. Elizabeth Warren (D-MA) and Sen. Bernie Sanders (I-VT) speak as Tom Steyer looks on after the Democratic presidential primary debate at Drake University on January 14, 2020 in Des Moines, Iowa. Six candidates out of the field qualified for the first Democratic presidential primary debate of 2020, hosted by CNN and the Des Moines Register. (Photo by Scott Olson/Getty Images)
Democratic presidential hopeful former Vice President Joe Biden participates of the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)
DES MOINES, IOWA - JANUARY 14: Staff members await the candidates in the spin room at the end of the Democratic presidential primary debate at Drake University on January 14, 2020 in Des Moines, Iowa. Six candidates out of the field qualified for the first Democratic presidential primary debate of 2020, hosted by CNN and the Des Moines Register. (Photo by Spencer Platt/Getty Images)
DES MOINES, IOWA - JANUARY 14: Former South Bend, Indiana Mayor Pete Buttigieg prepares for television interview in the spin room after the Democratic presidential primary debate at Drake University on January 14, 2020 in Des Moines, Iowa. Six candidates out of the field qualified for the first Democratic presidential primary debate of 2020, hosted by CNN and the Des Moines Register. (Photo by Spencer Platt/Getty Images)
DES MOINES, IOWA - JANUARY 14: Sen. Bernie Sanders (I-VT) delivers his closing statement during the Democratic presidential primary debate at Drake University on January 14, 2020 in Des Moines, Iowa. Six candidates out of the field qualified for the first Democratic presidential primary debate of 2020, hosted by CNN and the Des Moines Register. (Photo by Scott Olson/Getty Images)
Democratic presidential hopeful Massachusetts Senator Elizabeth Warren participates of the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)
DES MOINES, IOWA - JANUARY 14: Former South Bend, Indiana Mayor Pete Buttigieg speaks during the Democratic presidential primary debate at Drake University on January 14, 2020 in Des Moines, Iowa. Six candidates out of the field qualified for the first Democratic presidential primary debate of 2020, hosted by CNN and the Des Moines Register. (Photo by Scott Olson/Getty Images)
DES MOINES, IOWA - JANUARY 14: Former Vice President Joe Biden speaks as Sen. Elizabeth Warren (D-MA) and Sen. Bernie Sanders (I-VT) (R) listen during the Democratic presidential primary debate at Drake University on January 14, 2020 in Des Moines, Iowa. Six candidates out of the field qualified for the first Democratic presidential primary debate of 2020, hosted by CNN and the Des Moines Register. (Photo by Scott Olson/Getty Images)
(L-R) Democratic presidential hopefuls billionaire-philanthropist Tom Steyer, Massachusetts Senator Elizabeth Warren, Former Vice President Joe Biden, Vermont Senator Bernie Sanders, Mayor of South Bend, Indiana, Pete Buttigieg and Minnesota Senator Amy Klobuchar speak during the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)
(L-R) Democratic presidential hopefuls Vermont Senator Bernie Sanders, Mayor of South Bend, Indiana, Pete Buttigieg and Minnesota Senator Amy Klobuchar participate in the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)
Democratic presidential hopeful Minnesota Senator Amy Klobuchar speaks with a journalist in the spin room after the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by kerem yucel / AFP) (Photo by KEREM YUCEL/AFP via Getty Images)
DES MOINES, IOWA - JANUARY 14: Former South Bend, Indiana Mayor Pete Buttigieg (R) listens as Sen. Bernie Sanders (I-VT) makes a point during the Democratic presidential primary debate at Drake University on January 14, 2020 in Des Moines, Iowa. Six candidates out of the field qualified for the first Democratic presidential primary debate of 2020, hosted by CNN and the Des Moines Register. (Photo by Scott Olson/Getty Images)
DES MOINES, IOWA - JANUARY 14: Actress Mandy Moore attends the Democratic presidential primary debate at Drake University on January 14, 2020 in Des Moines, Iowa. Six candidates out of the field qualified for the first Democratic presidential primary debate of 2020, hosted by CNN and the Des Moines Register. (Photo by Scott Olson/Getty Images)
Democratic presidential hopefuls former Vice President Joe Biden and Vermont Senator Bernie Sanders particiapate of the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)
DES MOINES, IOWA - JANUARY 14: Professor Cornel West listens to the Democratic presidential primary debate at Drake University on January 14, 2020 in Des Moines, Iowa. Six candidates out of the field qualified for the first Democratic presidential primary debate of 2020, hosted by CNN and the Des Moines Register. (Photo by Scott Olson/Getty Images)
DES MOINES, IOWA - JANUARY 14: Sen. Amy Klobuchar (D-MN) prepares for television interview in spin room after the Democratic presidential primary debate at Drake University on January 14, 2020 in Des Moines, Iowa. Six candidates out of the field qualified for the first Democratic presidential primary debate of 2020, hosted by CNN and the Des Moines Register. (Photo by Spencer Platt/Getty Images)
Members of the media work in the spin room during the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by kerem yucel / AFP) (Photo by KEREM YUCEL/AFP via Getty Images)
Members of the media work in the spin room during the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by kerem yucel / AFP) (Photo by KEREM YUCEL/AFP via Getty Images)
DES MOINES, IOWA - JANUARY 14: Sen. Elizabeth Warren (D-MA) and Tom Steyer speak during the Democratic presidential primary debate at Drake University on January 14, 2020 in Des Moines, Iowa. Six candidates out of the field qualified for the first Democratic presidential primary debate of 2020, hosted by CNN and the Des Moines Register. (Photo by Scott Olson/Getty Images)
(L-R) Democratic presidential hopefuls billionaire-philanthropist Tom Steyer, Massachusetts Senator Elizabeth Warren, Former Vice President Joe Biden, Vermont Senator Bernie Sanders, Mayor of South Bend, Indiana, Pete Buttigieg and Minnesota Senator Amy Klobuchar speak during the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)
Democratic presidential hopeful billionaire and philanthropist Tom Steyer speaks with the media at the spin room following the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Kerem Yucel / AFP) (Photo by KEREM YUCEL/AFP via Getty Images)
DES MOINES, IOWA - JANUARY 14: Tom Steyer (L), Sen. Elizabeth Warren (D-MA), Sen. Bernie Sanders (I-VT) and former South Bend, Indiana Mayor Pete Buttigieg (R) listen as former Vice President Joe Biden (C) speaks during the Democratic presidential primary debate at Drake University on January 14, 2020 in Des Moines, Iowa. Six candidates out of the field qualified for the first Democratic presidential primary debate of 2020, hosted by CNN and the Des Moines Register. (Photo by Scott Olson/Getty Images)
DES MOINES, IOWA - JANUARY 14: Former South Bend, Indiana Mayor Pete Buttigieg (R) and former Vice President Joe Biden (L) listen as Sen. Bernie Sanders (I-VT) makes a point during the Democratic presidential primary debate at Drake University on January 14, 2020 in Des Moines, Iowa. Six candidates out of the field qualified for the first Democratic presidential primary debate of 2020, hosted by CNN and the Des Moines Register. (Photo by Scott Olson/Getty Images)
Democratic presidential hopeful Minnesota Senator Amy Klobuchar speaks during the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)
Democratic presidential hopefuls billionaire-philanthropist Tom Steyer and Massachusetts Senator Elizabeth Warren speak during a break in the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Robyn Beck / AFP) (Photo by ROBYN BECK/AFP via Getty Images)
Democratic presidential hopeful billionaire and philanthropist Tom Steyer speaks with the media at the spin room following the seventh Democratic primary debate of the 2020 presidential campaign season co-hosted by CNN and the Des Moines Register at the Drake University campus in Des Moines, Iowa on January 14, 2020. (Photo by Kerem Yucel / AFP) (Photo by KEREM YUCEL/AFP via Getty Images)
DES MOINES, IOWA - JANUARY 14: Sen. Amy Klobuchar (D-MN) makes a point as former South Bend, Indiana Mayor Pete Buttigieg reacts during the Democratic presidential primary debate at Drake University on January 14, 2020 in Des Moines, Iowa. Six candidates out of the field qualified for the first Democratic presidential primary debate of 2020, hosted by CNN and the Des Moines Register. (Photo by Scott Olson/Getty Images)
DES MOINES, IOWA - JANUARY 14: Members of the media watch the CNN Democratic Presidential Debate on January 14, 2020 in Des Moines, Iowa. Six candidates out of the field qualified for the first Democratic presidential primary debate of 2020, hosted by CNN and the Des Moines Register. (Photo by Spencer Platt/Getty Images)
DES MOINES, IOWA - JANUARY 14: Members of the media watch the CNN Democratic Presidential Debate on January 14, 2020 in Des Moines, Iowa. Candidates will have their chance to make an impression on Iowa voters before the caucus on February 3rd. (Photo by Spencer Platt/Getty Images)
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Sanders spent the weekend, in conversations with reporters, hitting his top rival for previously supporting cuts to Social Security, while also stressing that Biden “is a decent person. He's a friend of mine, and people like him.”

“And we're not going to make personal attacks on Joe Biden,” Sanders said Sunday afternoon.

In 2016, Sanders was criticized for hurting the party with a protracted primary contest against Hillary Clinton. This time around, Sanders calls several of his rivals “friends.”

He was the first candidate to sign a #WeAreIndivisible pledge last spring that promised, in part, to “immediately” endorse the Democratic nominee. He regularly makes clear his confidence of the other Democratic candidates.

However, for the past two weeks, and with different candidates, Sanders and his campaign have been at the center of the field’s biggest clashes. These clashes were started by or escalated with the words or actions of Sanders campaign staff and surrogates, prompting responses by the candidate.

“As Democrats I thought we all knew this election was too important to attack other Democrats,” Biden wrote in a Monday fundraising email to supporters after the two went back and forth over the weekend.

“But Bernie Sanders and his campaign don’t care about that,” Biden’s email to supporters continued, “They’ve decided to unleash a barrage of negative attacks lying about and distorting my record.”

Saturday, Biden demanded an apology from the Sanders campaign, after it shared a series of video clips highlighting Biden’s openness to cuts or freezes to Social Security. One clip retweeted by an adviser was misleading and out of context, and suggested Biden praised cuts to Social Security proposed by former House Speaker Paul Ryan.

The previous week, Sanders battled with Sen. Elizabeth Warren, D-Mass., in another clash that began as a result of the actions of some in his campaign, who created volunteer talking points attacking his progressive ally about recollections of a private 2018 conversation.

The growing disputes come with the Iowa caucuses less than two weeks away. In the days before last week’s debate, top surrogate and campaign co-chair Nina Turner wrote an op-ed that criticized Biden's past policies affecting black America. Senior adviser Jeff Weaver also released a strong statement, challenging Biden's Iraq War vote.

Now, Sanders is urging his campaign to focus.

Sanders told CBS News he does not approve of the aggressive online attacks by some of his supporters. While noting that it is not just a problem with his campaign, he said “I appeal to my supporters: Please, engage in civil discourse.”

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