I watched the hearing in its entirety, live. I watched the commentary afterwards on MSNBC, CNN, and Fox. This is my takeaway:
The hearing was about article 704 (702?.. whatever)... Senate requested input on the value of intelligence gained by the law (which is expiring and needs Senate support to renew). Testimony about the use, utility, and controls over of the powers granted to the Intelligence community by this law was given. Most senate members chose to ask questions about Trump allegedly asking them to influence the FBI director to lay off the Russiagate investigation. They all responded that they never "felt pressure". They refused to answer the (multiple, direct, repeated, clarified and restated..) question of IF Trump asked them.. (multiple Senators pointed out that their "feelings" about it were irrelevant - but did it happen at all). Refusal to answer. When pushed on the topic of WHY they would not answer, they could site to legal reason (such as Executive privilege or any other reason).
What was not well covered, in my opinion, is that one of the 4 testifying did make one statement of fact that they could not answer that question because there was an ongoing CRIMINAL investigation on that topic. So, they are not answering so as not to potentially impact the quality of that investigation... it seemed to go right over the media's head.