In the past week-and-a-half, Sanders has also put together six virtual events focused on the coronavirus that have received millions of views, according to his team, including town halls and rallies featuring members of the so-called “Squad” and musical acts. On “All In with Chris Hayes” Monday, Sanders said that “what we are doing is transitioning our campaign to a virtual campaign.”

Some of Sanders’ aides and allies argue he could win despite the long odds, and that he has a position to fill in pushing for progressive policy, especially during the coronavirus pandemic.

The moves — and that line of thinking — are infuriating to some establishment Democrats and Biden allies, who fear a repeat of 2016, when Sanders declined to drop out after it was mathematically impossible for him to win. Many party leaders believe the delay further fractured the already divided Democrats and made it more difficult for Hillary Clinton to take on Donald Trump.