Is it possible Comet Ping Pong and associates are people of interest in another investigation, therefore making Ketanji Brown a possible witness to be called as part of a trial? I don't think you can take a promotion/nomination if you are involved with a case. Same thing they tried to pull on Clarence and thats why they had to iron out the Anita Hill shit before he got confirmed.

Edit: Now that i think about it, the Trump lawsuits might name her in some fashion.