I think it is an error to conduct them without getting all the information they need, for sure. To date, only his comments made in several venues and the multiple visits to the White House are topics of discussion.
I’d prefer they take some time and investigate all the multiple contracts he received over the last six years. How they were bid, what was the pricing structure, was effort on simultaneous contracts bid as full-time-equivalent, etc. The WH can give out contracts however they want (e.g., sole source), but the contract eventually has to go through some sort of award audit where all these things are reviewed and approved as legitimate.
All expenditures of federal funds must be fully delineated in the Federal Register and/or Congressional Review.
Taxpayers should ask their congressmen to supply them w/ copies of these public documents.
A spectacle today does not preclude that for which you wish