To the surprise of some attendees, the Connecticut Democrat—a rising star in the party’s left flank—responded that some lawmakers had been doing informal counts to see whether enough votes existed to remove the New York Democrat from his leadership position, according to people familiar with the mid-February dinner. Murphy explained that Schumer had enough backing to remain as leader. But the disclosure stood out nonetheless, because it revealed that frustration inside the Senate had reached a high enough level that some Democrats were actively contemplating how to oust Schumer.