The behind-closed-door testimony is meaningless unless they publish it. When they do it has been very short clips following a lengthy introduction to tell us what to believe about what we are about to see. That is much more like a journalistic hit piece, then a congressional investigation. If they are interested in learning the truth and getting the truth out, of course they would call those Secret Service agents in to confront them about Hutchinson's allegations. If they are only interested in telling a story then of course they will simply say the end after Cassidy finishes.
I've stated several times that Trump did the wrong thing on that date. Trump is an obnoxious braggart, who often lets himself be caught up in emotion. Which makes it kind of sad that he is a better president then nearly everyone who is likely to run against him, simply because he acts in the best interest of the United States.