Jeff Weaver, a senior adviser to Sanders, then seemed to try and defuse the situation, refusing to refute Warren's version and instead saying only on CNN on Monday night that "those conversations can sometimes get misconstrued".
Bernie Sanders has denied telling Elizabeth Warren, his rival in the race to become the Democrats' candidate in the U.S. presidential election, he did not think a woman could win the White House.
The two agreed that if they ultimately faced each other as presidential candidates, they should remain civil and avoid attacking one another, so as not to hurt the progressive movement.
Politico reported over the weekend on the Sanders campaign's talking points instructing volunteers to say that Warren's supporters are "highly-educated, more affluent people who are going to show up and vote Democratic no matter what" and that "she's bringing no new bases into the Democratic Party".
"It is ludicrous to believe that at the same meeting where Elizabeth Warren told me she was going to run for president, I would tell her that a woman couldn't win", Sanders said in a statement to CNN Monday.
"What I did say that night was that Donald Trump is a sexist, a racist and a liar who would weaponize whatever he could", he said. "I would tell her that a woman couldn't win". According to at least one post-2016 election analysis, 1 in 10 people who voted for Sanders in the primaries voted for Trump - not Clinton - in the final. Kristen Orthman, the Warren campaign's communication director, on the other hand, declined to comment for the story by CNN political correspondent MJ Lee. With the new allegations from sources close to Warren however, the truce between the two socialist senators tag-teaming their way through previous debates is likely to change this week with the next primetime event on Tuesday in Des Moines, Iowa.
"Among the topics that came up was what would happen if the Democrats nominated a female candidate", she said.
The revelation that Sanders expressed skepticism that Warren could win the presidency because she is a woman is particularly noteworthy now, given that Warren is the lone female candidate at the top of the Democratic field.
What she's saying: "Bernie and I met for more than two hours in December 2018 to discuss the 2020 election, our past work together and our shared goals", Warren said.
Last month, Warren said in Las Vegas that she had "lived enough of my life with men, and it's mostly been men, telling me to sit down and be quiet". "I talk to Elizabeth Warren every single day". "I know Bernie is in the race for the same reason".
"We have been friends and allies in this fight for long time, and I have no doubt we will continue to work together to defeat Donald Trump and put our government on the side of the people."
Six candidates have qualified to take part including former Vice-President Joe Biden and South Bend Mayor Pete Buttigieg. Amy Klobuchar of Minnesota and billionaire investor and environmentalist Tom Steyer.
Tuesday night's event will be the last debate until voters cast the first votes of the 2020 election at the Iowa caucuses slated to be held on February 3.
Warren and Sanders, long the two most progressive candidates, will start differentiating themselves as they head into primary season, and polls show Sanders with a slight edge in Iowa. Those efforts could produce fireworks at Tuesday's debate.
Fortified by his resilient showing in recent polls despite suffering a heart attack last November, Sanders appeared eager to seize the moment and went on the offensive against rivals. Warren and Buttigieg were in a statistical tie with Sanders, while Biden was behind at 15 per cent support.
The accusation comes at a very inconvenient time for Mr Sanders.
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Nevertheless, Erivo - who was also nominated for best original song for Stand Up - said she was honoured to be nominated. In the past 10 years, the only woman nominated was Greta Gerwig in 2017 for Lady Bird .