Sens. Bernie Sanders and Elizabeth Warren on Tuesday dove into their dispute over whether a woman can win the 2020 presidential election, with Sanders denying he ever said it was impossible. Warren was having none of it.

"Look at the men on this stage — collectively, they have lost 10 elections," Warren said in a Democratic presidential debate in Iowa. "The only people on stage who have won every single election they've been in are the women."

The issue has strained a previously civil competition between Sanders and Warren, who are fighting for the same progressive votes.