Some Republicans fear a tea party-like backlash against the trillions of dollars in spending Congress approved, said Robert L. Bixby, executive director of the Concord Coalition, a deficit watchdog group.

“I just think that they are very much afraid that their constituents are going to revolt over the size of the money that’s being spent,” Bixby said. “I think they’re going back and thinking about the summer of Obamacare, when there was a backlash against the Democrats.”