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.) reportedly said she is "deeply" concerned by comments former Vice President 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, her competitor in the 2020 primary, made regarding working with segregationist senators.

"Yes, it concerns me deeply. If those men had their way, I wouldn't be in the United States Senate and on this elevator right now," Harris said Wednesday, according to tweets from several reporters.

.@SenKamalaHarris is asked if she’s concerned about Biden’s segregationist remarks: “Yes it concerns me deeply. If those men had their way, I wouldn’t be in the United States Senate and on this elevator right now.” — Mariam Khan (@MKhan47) June 19, 2019

Biden came under fire after he cited his working relationships with two segregationist senators in the 1970s as an example of a bygone era of "civility" in the Senate.

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Biden said he didn’t “agree on much” with former Sens. James Eastland (D-Miss.) and Herman Talmadge (D-Ga.) but that they “got things done.”

Eastland blocked more than 100 civil rights-related bills during his time as Senate Judiciary Committee chairman.

Biden, who is making his third attempt for the White House in 2020, faces a crowded field of younger, more diverse candidates and many who are to his left.

His comments were also condemned by Democratic primary challengers 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, Sen. Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (Mass.), Sen. 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 (N.J.) and former Rep. John Delaney John DelaneyCoronavirus Report: The Hill's Steve Clemons interviews Rep. Rodney Davis Eurasia Group founder Ian Bremmer says Trump right on China but wrong on WHO; CDC issues new guidance for large gatherings The Hill's Coronavirus Report: Kansas City Mayor Quinton Lucas says country needs to rethink what 'policing' means; US cases surpass 2 million with no end to pandemic in sight MORE (Md.)

Biden sits at the top of the field in most polls, but his support has dipped since he launched a few months ago.

The Hill has reached out to Harris's office for comment.