If he can’t block the circus, he can at least demand that no artificial limits be placed on witnesses. This 1 for 1 idea is stupid as hell. Let the Dems call their witnesses, let the Republicans call their witnesses, including those interviewed in secret in the basement, and Ukrainian witnesses via special visas, and Joe and Hunter and Blowy and the mystery IG and Schiff-for-brains. And litigate executive privilege issues regarding each witness the Dems want to call. Open the floodgates, and let Wile E. Coyote blow himself up on his latest Acme product.
That is why there is a 60/40 chance of not happen.