I believe both are valid constitutional options.
Pull the calendar and reschedule floor votes to January and punish Flake by blocking the bill from ever coming to a vote.
Let him twist slowly in the wind. Senate shouldn’t be held hostage to the lines of him.
McTurtle should tell Flake if he got his way, it wouldn’t protect Mueller; it would result in his being fired because it would remove any incentive the President has to defer to Congress.
It would accomplish the exact opposite of what Trump’s enemies seek in tying his hands.
That is if Flake can be made to see reason. I doubt it.