In a letter published Wednesday on Medium, an anonymous group of Biden’s campaign staffers demanded the president call for a ceasefire in Gaza, citing concerns that not shifting his policy on the issue could hurt his 2024 chances.

“Biden for President staff have seen volunteers quit in droves, and people who have voted blue for decades feel uncertain about doing so for the first time ever, because of this conflict,” the Medium letter read.

“It is not enough to merely be the alternative to Donald Trump,” the campaigners continued. “The campaign has to shift the feeling in the pits of voters’ stomachs, the same feeling that weighs on us every day as we fight for your reelection. The only way to do that is to call for a ceasefire.”