What’s the fascination with a closed door hearing?
The first rule of cross examination is: NEVER ask a question whose answer you do not already know.
The Republicans want to take a private deposition to discover what Hunter Biden will say.
Then they want to examine under oath, so they can re-ask all the questions to which he had bad or no answers in a public forum.
It’s standard procedure for trials. It’s what the J6 commmitee did to multiple conservative witnesses.