I actually think this is a good move. I don’t think putting Schiff in front of a microphone is a good idea. It may sound nice in theory to hammer him with questions, but he won’t answer them directly and will just keep hitting his own narrative. And hte press would love nothing more than to show Schiff repeating their themes rather than putting on the testimony of other witnesses.
Schiff is a red herring here. He’s already said he won’t testify in the Senate.
What’s really going on here is Graham is despicably floating the idea of the GOP controlled Senate not allowing POTUS to defend himself in the Senate. Defend that if you want. I won’t be.
Well, that's speculation on your end. If Graham does end up not letting Trump defend himself, then I will condemn him at that point. But that hasn't happened yet.
It probably should be noted that Graham has expressly endorsed the idea of investigating the Bidens. He's been one of the most aggressive Republicans in pushing that idea. So I question your inference that he's really trying to prevent Trump from defending himself.
But like I said, when and if he does take that position, he would deserve to be condemned.