Who chooses? It's the equivalent of a defeated general getting to nname his replacement?
He has to be approved by a vote of the Republican National Committee. Each state elects a National Committee man and woman, I believe the State GOP Chair sits on the committee, and if it is like the State GOP's, the elected national officials also sit on the Committee. It takes a majority vote of the committee to approve the President's recommendation.
I will go check to see if there are others who sit on the Committee but we need to start right now with an effort to derail this nomination. We need a full time RNC Chair IMO!