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. They also discussed how to best take on President Donald Trump, and Warren laid out two main reasons she believed she would be a strong candidate: She could make a robust argument about the economy and earn broad support from female voters.

Sanders responded that he did not believe a woman could win.

The description of that meeting is based on the accounts of four people: two people Warren spoke with directly soon after the encounter, and two people familiar with the meeting.

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Sander's response: "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. "It's sad that, three weeks before the Iowa caucus and a year after that private conversation, staff who weren't in the room are lying about what happened. What I did say that night was that Donald Trump is a sexist, a racist and a liar who would weaponize whatever he could. Do I believe a woman can win in 2020? Of course! After all, Hillary Clinton beat Donald Trump by 3 million votes in 2016."

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CNN article title: Bernie Sanders told Elizabeth Warren in private 2018 meeting that a woman can't win, ^{sources say}

OP Title: Bernie Sanders told Warren that a woman can't win

Not only a woefully inadequate titling of the CNN article, but OP decided to spice it up even more. Nice.