Former Attorney General Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings MORE on Wednesday cautioned the 2020 Democratic White House hopefuls from attacking the record of the Obama administration following a raucous debate where front-runner 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 was questioned by several candidates on his record while serving as President Obama's vice president.

In a tweet sent shortly after the debate ended, Holder addressed his "fellow Democrats."

"Be wary of attacking the Obama record. Build on it. Expand it. But there is little to be gained — for you or the party — by attacking a very successful and still popular Democratic President," Holder, Obama's attorney general from 2009 to 2015, tweeted.

To my fellow Democrats. Be wary of attacking the Obama record. Build on it. Expand it. But there is little to be gained - for you or the party - by attacking a very successful and still popular Democratic President. — Eric Holder (@EricHolder) August 1, 2019

His remarks came after Biden was hammered by several candidates on actions he took both during and before his time with the Obama administration.

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He had one sharp exchange with New York City Mayor Bill de Blasio Bill de BlasioOVERNIGHT ENERGY: California seeks to sell only electric cars by 2035 | EPA threatens to close New York City office after Trump threats to 'anarchist' cities | House energy package sparks criticism from left and right EPA threatens to close New York City office after Trump threats to 'anarchist' cities New Year's Eve in Times Square to be largely virtual amid pandemic MORE (D) during which de Blasio repeatedly asked Biden whether he had ever attempted to convince Obama to slow the rate of deportations of undocumented immigrants during his time in the White House.

Biden also characterized efforts to push for "Medicare for All," championed by both de Blasio and 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.) during Wednesday's debate, as an effort to repeal the Affordable Care Act that was the landmark legislative achievement passed during the Obama administration.

The Biden campaign released a fundraising email following the debate offer a sticker that references Biden's comments saying "this is a big f---ing deal" caught on a mic when Obama signed the Affordable Care Act into law.

The campaign stickers read: "Obamacare: It's a BFD."