Three of Joe Biden’s senior aides entered a Senate Democratic lunch on Thursday armed with internal and external polls showing the presidential race still within the margin of error, hoping to keep this last bastion of support from abandoning his embattled campaign.

During a difficult and at times tearful meeting with Mike Donilon, Steve Ricchetti and Jen O’Malley Dillon, senators aired concerns about the president’s ability to serve for another four years, his path to defeat former President Donald Trump and the effect Biden’s poor polling might have on Democrats running down the ballot, according to five people familiar with the meeting who were granted anonymity to describe private discussions.

But by the end of the lunch, Sen. John Fetterman of Pennsylvania had enough.