Senator Elizabeth Warren speaks as Senator Bernie Sanders looks on.

Sen. Elizabeth Warren said late Monday that Sen. Bernie Sanders had told her he didn't think a woman could win the 2020 election — a statement the Sanders campaign had blasted as "a lie" earlier in the day.

"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," the Massachusetts senator said in a statement. "Among the topics that came up was what would happen if Democrats nominated a female candidate. I thought a woman could win; he disagreed," she said.