You really think they want Trump sworn in under oath? You think there is a lawyer out there willing to work for Trump who would allow it?
Trump will make his claims. The committee will make their claims. Nobody will be convinced of anything.
This “committee” will not permit Trump to to testify. They want him in the chair to sit quietly and listen for hours while being chastised and accused relentlessly. You would see red-faced screeching “RECLAIMING MY TIME” and a pounding gavel requiring the “witness” to suspend.