The Republicans should get on the commission, and their introductory speeches should say:
"The biggest threat to domestic security in the last five years has been the unrestricted growth of the left-wing agitprop street gangs Antifa and (b)lack Lies Matter. Until the Congress serves to investigate those domestic terrorist organizations, this Commission cannot succeed in it's purpose. I therefore resign my position on this commission."
Drop mike.
Walk off stage.