The apology comes a day after Politico published a story on allegations of sexual harassment made by a female staffer against Robert Becker, the man who oversaw Sanders' Iowa campaign operation.

Becker has denied the allegations against him, telling Politico: \"I categorically deny these allegations of improper and unprofessional conduct,\" saying the alleged assault is \"at odds with my recollection of a late evening filled with many hugs and kisses and tears and conversations about what’s next.\"

The New York Times also reported earlier this month on the allegations of sexism from female staffers that worked on the Senator's 2016 campaign against former Secretary of State Hillary Clinton.

Sanders again Thursday denied knowledge of the alleged harassment, but top officials from his campaign have acknowledged that the gender make-up of any future campaign would need to look sufficiently different to address systemic sexism.

\"Speaking generally about 2016, was it too male? Yes. Was it too white? Yes,\" former Sanders campaign manager Jeff Weaver said in a statement after the allegations surfaced.

\"Would this be a priority to remedy on any future campaign? Definitely, and we share deeply in the urgency to make the necessary changes. In 2016, as the size of our campaign exploded we made efforts to make it a positive experience for people. That there was a failure pains me very much,\" Weaver added.

\"PHOTO:
Ethan Miller/Getty Images, FILE
PHOTO: Democratic presidential candidate Sen. Bernie Sanders at the Henderson Pavilion in this Feb. 20, 2016 file in Henderson, Nev.
>

Sanders staffers have been actively discussing the need for significant differences in the gender makeup in the leadership of any future presidential campaign.

Part of those changes include Weaver not returning to his role as campaign manager in any future Sanders presidential bid.

Sanders himself has not yet made a decision on whether or not he will run for President in 2020, but released an e-mail late last year with the subject line \"If I Run.\"

\"Whenever I am asked about running for president in 2020, I answer that if I am the best candidate to beat Donald Trump, then I will probably run. That is the truth,\" Sanders wrote in the fundraising pitch.

ABC News' MaryAlice Parks contributed to this story.

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