The only point to hearing him is to puff up a sham accusation. Let the DEMs have at him. He won't be the first to testify out of school and contrary to honorable practice. Kent, Sondland, Vindman, and so on.
I really don’t want Bolton testifying but Linda could insert a place marker just in case liddle Schitt gets his way. No testimony is preferred but public record testimony is lesser of evils as compared to liddle Schitt’s double secret process and subsequent coordinated leaks/attacks through the MSM.