By whom?
By Pelosi by the rule... but the 'pubbies, being in the minority, should have done what the Dems would have done were the tables turned the other way. For example, in the most partisan impeachment commission ever held, with Schiff declaring testimonies exculpatory to POTUS 'classified' (thus prohibiting 'pubbies from revealing the truth), the GOP should have made a big uproar and interrupted the hearings, demanding Schiff be removed. The MSM would tear them up, so they sit in silence instead of drawing public opinion to what is going on.
Schiff kept testimonies secret concerning Russian collusion and repeatedly came out of the hearings claiming there was clear evidence of treason; the 'pubbies stayed silent, leading to the $30 mil Mueller investigation and tying POTUS' hands for two years to conduct foreign policy and leading to the appointment of Wm Barr as AG. POTUS has to carry the load alone.
Schiff conspired with DS people - ICIG, Vindman, the whistleblower, others - to set up a fake impeachment... where is the GOP uproar? A huge portion of Americans are unaware of any of this.
This GOP does not represent me and I believe most of FR, most conservative patriots. While the Dems will pull all sorts of questionable tactics to achieve what they want, the GOP sits in fear of the MSM. - AND many of them complicit in the chaining of Donald Trump.