Representative Adam B. Schiff, the California Democrat who is running for Senate, warned during a private meeting with donors on Saturday that his party was likely to suffer overwhelming losses in November if President Biden remained at the top of the ticket, according to two people with direct knowledge of Mr. Schiff’s remarks at the meeting.
If Mr. Biden remained, not only would he lose to former President Donald J. Trump, he could be enough of a drag on other Democratic candidates that the party would most likely lose the Senate and miss an opportunity to win control of the House, Mr. Schiff said at a fund-raiser in New York.
“I think if he is our nominee, I think we lose,” Mr. Schiff said during the meeting, according to a person with access to a transcription of a recording of the event. “And we may very, very well lose the Senate and lose our chance to take back the House.”
Mr. Schiff’s remarks underscore the depth of the concerns in the president’s party about the prospects for downballot Democrats if Mr. Biden remains in the race, even if most senior Democrats are still unwilling to express such dire warnings in public.
The event was held in East Hampton, N.Y., shortly before Mr. Trump was shot on Saturday. Public calls from Democrats for Mr. Biden to step aside as a candidate have dropped off since the attempt on Mr. Trump’s life, providing Mr. Biden, who is insisting the he will remain in the race, an opportunity to overcome the dissent.
In an effort to end the internal battle, leaders of the Democratic National Committee are moving to formally nominate Mr. Biden as the party’s candidate by the end of the month, weeks before their convention in Chicago in August.
