The chairman of the Hillary Clinton’s campaign, John Podesta, delivered a simple and sharp message to disgruntled Bernie Sanders fans Tuesday morning: “Get over it.”

“I think that Bernie went a long way to [ending Democratic discord] last night when he gave her a full-throated endorsement,” he said.

Podesta continued, “I think we began that process last night, I think that as Sarah Silverman said… we’ve got to get over it. You know, we tried to honor what Bernie had done last night… one of the things about Bernie is that he’s been doing that his whole career, and we appreciate that, we support it, it strikes the Democratic Party. But we need to move on and consolidate around Hillary.”

Podesta’s remarks come the morning after committed Sanders supporters used the opening day of the Democratic convention to drown out speakers with chants of “Bernie! Bernie!” and loudly booing the mention of Hillary Clinton’s name.

Comedian Sarah Silverman — who initially supported Sanders —said she was proud to “be a part of Bernie’s movement” but said it was essential to elect Clinton.

“Can I just say to the Bernie-or- bust people, you’re being ridiculous,” she said.