Sanders, his top aides and the writers of the letter have not yet had a face-to-face meeting.
"To the women in that campaign who were harassed or mistreated I apologize. Our standards and safeguards were inadequate".
Over two dozen 2016 campaign staff alumni wrote a letter seeking a meeting with Sanders to "discuss the issue of sexual violence and harassment on the 2016 campaign, for the goal of planning to mitigate the issue in the upcoming presidential cycle".
"Candidates who allow people like Robert Becker to lead their organizations shouldn't earn the highest office in our government", she told Politico. "Then he moved his hands to her head and forcibly kissed her, putting his tongue in her mouth as he held her, the woman and other sources said".
Becker has been conducting unaffiliated Sanders campaign work in recent months, which included calling potential staffers and traveling to early primary states to prepare for a possible presidential run. The campaign staffers had gathered at the restaurant to mark the end of Sanders's presidential bid.
"It just really sucks because no one ever held him accountable and he kept pushing and pushing and seeing how much he could get away with", the woman told Politico. This can't happen in 2020. The alleged assault, he wrote, is "at odds with my recollection of a late evening filled with many hugs and kisses and tears and conversations about what's next".
No charges have been filed.
Allegations of sexual misconduct and an "untenable and unsafe dynamic that developed during [the Sanders] campaign" have dogged the Vermont senator in recent weeks, according to Politico.
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"Yes, I was a little bit busy running around the country trynna make the case", he said when asked if he had missed the harassment on his campaign.
Politico reported Thursday morning that Sanders's former Iowa campaign manager was part of a $30,000 federal discrimination settlement with two former employees.
His apology comes as he contemplates another White House bid under the Democratic banner in 2020.
US Senator Bernie Sanders is apologising to women who've shared experiences of harassment by male supervisors while working on his 2016 presidential campaign.
It has been reported that Weaver's decisions around complaints of sexual misconduct was troublesome and that there was no clear path for complaints to be made, according to the New York Times. A former Sanders delegate called the culture an "entire wave of rotten sexual harassment that seemingly was never dealt with".
She said she felt compelled to speak out after Mr Becker travelled to SC in December on a trip to recruit future campaign workers for Mr Sanders. "Later in the night, Becker approached the woman and grabbed her wrists".
"Clearly we need a cultural revolution in this country to change workplace attitudes and behavior".