No matter how much evidence investigators put in front of Republican Senators--and no matter how first-hand, grave, credible, and compelling it is--it makes not one bit of difference to how they feel and are convinced their base feels. So they stick their fingers in their ears.
Give them the information they demand, and they'll refuse to read it. Let them have their wish list for the hearings, and they'll say it came too late. 
We can post all this stuff to shame Sen Graham, but it's an empty effort. He doesn't care. Whatever it is Trump offers him means more to him than any abstract duty he has as a Senator, the rule of law, or his own honor and reputation.
