“The thing I worry most about is that we become we like the House of Representatives. What’s the next step? Legislation?” said Sen. John McCain (R-Ariz.).

“I’m convinced it’s a slippery slope.”

Sen. Bob Corker (R-Tenn.) warned last week on the Senate floor that growing pressure from the right and the left will make it difficult to withstand calls to eliminate the legislative filibuster.

“If we continue on the path we’re on right now, the very next time there’s a legislative proposal that one side of the aisle feels is so important they cannot let their base down, the pressure builds, then we’re going to vote the nuclear option on the legislative piece,” he said.

“That’s what will happen. Somebody will do it.”