Comey should have been given the boot by Obama months ago. People should be asking why, after the mess over Clinton, was  Comey kept on by Obama ?
Did Comey have something on Obama or others in his administration?
Why was Comey feared so much by people within the administrations of both Obama and Trump ?
Leads back to why did Obama keep it so quiet about the Russians hacking and meddling  in the election ? Obama did zero!
Trump is the scapegoat for Obama's lack of action regarding the whole Russian mess. 
Now a special independent prosecutor can be hired if and when there is solid evidence to pursue
a real investigation. 
The Senators, both sides, ask some really stupid questions and use their time for making political statements and grandstanding in front of the cameras. 
This happens every time there is a Senate or House Committee "investigating" something.
Get a real, qualified independent commission to conduct the hearing and turn it over to a special independent prosecutor.