The hearings that the House and Senate are holding are separate from what Mueller is doing. There is nothing IMO as to why any questioning by either House needs to be done behind closed doors and kept secret from the American public since this may have impacted a national election.
Kushner and Trump Jr's testimony behind closed doors should be made public. Along with any other testimony that was done behind closed doors.
We are not talking national security issues here and for that matter neither Kushner nor Junior had a security clearance to begin with.
Enough of the BS by both the House and Senate. You and I get up in the morning and put our pants on the same way these assholes do conducting the investigation. I don't want to hear anymore that they can't discuss what was said behind closed doors. Mueller can deal with that himself since he is conducting the criminal phase.