Speaking with MSNBC's Rachel Maddow, Sanders criticized the behavior his supporters were engaging in online towards rival Sen. Elizabeth Warren for not dropping out of the race, thereby splitting the progressive vote.
Maddow specifically referenced supporters tweeting images of snakes, calling her a traitor, and wanting her to be primaried in her next Senate election.
"I am absolutely aghast" and "disgusted" by the online vitriol, he said.
“I condemn that,” Sanders added. “We want our supporters to be [talking] about the issues...[we] don't need ugly, personal attacks against Sen. Warren, or anyone else for that matter."
He continued: "I think the Twitter world is an opportunity for people to have good, honest debates about issues, but not to make vitriolic attacks on people you disagree with."
Bernie Sanders: "Elizabeth Warren is a very, very excellent senator. She has run a strong campaign. She will make her own decision in her own time."— Sahil Kapur (@sahilkapur) March 4, 2020
On the vitriol toward her: "I'm disgusted by it," he says.
Sanders said he spoke privately with Warren as she considers the future of her campaign but he would not give details.
He also said it was "too early to talk about" the possibility of Warren as a running mate but that he'd "love to sit down and talk to her about what kind of role she could pay in our administration."
Warren performed incredibly poorly on Super Tuesday, even in her home state of Massachusetts where she finished third.