The skirmish began when David Sirota, Sanders’ former speechwriter, took a shot at the policy task forces that Sanders and presumptive Democratic nominee Joe Biden created in hopes of healing party rifts. Ex-campaign manager Faiz Shakir and Analilia Mejia, Sanders’ former national political director, have been in talks about the endeavor with top Biden advisers Anita Dunn — who is loathed by some progressives for previously consulting with disgraced Hollywood mogul Harvey Weinstein about a New York Times investigation — and Ron Klain.

“I don’t know who needs to hear this, but many of us don’t want to hear career Beltway political operatives boasting about task forces while this shit is going on right now,” Sirota tweeted. “Jfc — try to be a little less tone deaf.”

That prompted Mike Casca, Sanders’ current spokesman, to make an explosive charge shortly before 11 p.m. about a progressive newsletter Sirota currently runs, after managing a similar project on the 2020 campaign. The publication offers a paid annual subscription option at a cost of $50.

“[D]amn right,” Casca tweeted, “real change happens when you steal an email list from the campaign and use it to create your own paid newsletter. why can’t anyone see that? anyway, subscribe if you can.”