Elizabeth Warren remarked that Bernie Sanders is her friend during Tuesday’s Democratic debate, but there were clear signs that friendship isn’t on solid ground. After the debate ended all the candidates were shaking hands, but when Sanders extended his hand to Warren she ignored it. Instead, the pair engaged in a tense, short exchange that ended with Sanders throwing up his hands and walking away. Wednesday night, CNN released audio from the exchange so we now know what was said.

This was sparked after a moment earlier in the debate when Sanders denied telling Warren that a woman couldn’t win the presidency. Warren says that remark came from Sanders during a meeting the two had back in 2018.

But Warren stuck by her account of the conversation.

The New York Times writes:

The question of whether a woman can defeat Mr. Trump has been the long-whispered soundtrack of much of this Democratic primary, invoked constantly in voter interviews among even supporters of candidates like Ms. Warren and Ms. Klobuchar.

Ms. Warren had not directly addressed gender as forcefully as she did Tuesday night, when she vowed, in her closing statement, to become “the first woman president of the United States of America.”