They knew that if they let him speak he would have brought things up that they don’t want us to hear.
I do not see how any honest person could watch that hearing and not come away feeling utter comtempt for the Dems. They have literally become enablers of terrorism and the violent over-throw of the United States. It's quite interesting to me that it was Democrats who gave us the civil war (which began with mobs seizing federal property in the ante-bellum South following a lawful election that didn't go the way they wanted) and it is Democrats who are excusing, fomenting and actually encouraging identical tactics today because they can't accept the outcome of the last election. (Another lawful election which also happened to esconce a Republican in the White House). I actually think there is a deep philosophical connection between the Democrats then and now. It's not a coincidence.