Let him withdraw his guilty plea and hold a trial. I don’t see why he should be denied that.
lf not, then Senators are above the laws that the rest of us must obey. A Senator can then do anything he wants to you and does not have to answer for it, because he's better than you are.
He does not have to follow any of the rules the rest of us have to conform to, including the finality of court pleas.
Is that how you want things to be in this country? If so, get used to being a serf because that's all you will be.