Yeah what the others said, it's not even him.
Plus: this portion of the transcript refutes every single complaint about the whistleblower. He was right to speak up. Not to mention the rest of the evidence collected in the House hearings which backs him up and suggests this was a months-long pressure campaign against Ukraine and not an isolated event.
Complaining about the whistleblower at this point is like arguing over the first move of a chess match when it's the endgame and you should be concerned about queening pawns and blocking your opponent from doing so
Which would be equivalent to calling the top Administration witnesses, Trump included, so we could figure out exactly what happened here
But the GOP Senate blocked all that so naturally they are deflecting and complaining about any and everything else in the impeachment process