The looming threat of a convention fight is driving yet another painful wedge between his campaign and congressional Democrats, with none of the roughly 20 lawmakers interviewed for this story explicitly endorsing Sanders’ view that he should automatically get the nod if he has the most delegates — but not the majority.

“No, no, I think the rules are set and we ought to follow the rules. Especially when someone says follow the rules who’s not even a Democrat,” said Rep. Juan Vargas (D-Calif.), who has endorsed former NYC mayor Mike Bloomberg. “He just wants us to rubber stamp his election, which we shouldn’t do. I certainly won’t do.”

“That’s not what the rules say,” added Sen. Jon Tester (D-Mont.), who has not endorsed any 2020 hopeful currently running. “Come on, we’ve been dealing with a president who breaks the rules all the time, let’s not drop to that standard.”