Yes, of course, but at what cost? The point is that Senators (Jimmy Stewart notwithstanding) typically found the political cost of such malevolent and counterproductive grandstanding so outweighed any benefit that they seldom employed it--and McClintock is suggesting that same calculus will recur. He wants to call their bluff, which is usually a smart tactic when confronted by a bully.
I get that part. I just don’t understand, when the real filibuster ends, how Trump’s nominees get to 60. If all the Republicans vote for them, they’d still be 9 votes short.