Democratic 2020 U.S. presidential candidates (L-R) Senator Elizabeth Warren (D-MA) speaks with Senator Bernie Sanders (I-VT) as billionaire activist Tom Steyer listens after the seventh Democratic 2020 presidential debate at Drake University in Des Moines, Iowa, January 14, 2020.

Sen. Elizabeth Warren told Sen. Bernie Sanders, her fellow presidential candidate, after the recent Democratic debate that "I think you called me a liar on national TV," according to audio broadcast by CNN on Wednesday night.

The moment occurred following reports that Sanders, I-Vt., had previously told Warren, D-Mass., that he didn't think a woman could win a presidential election. Warren said it happened, and Sanders denied making the remark, including on the debate stage.