Back to my original theory, then, that this is about putting a permanent cloud over the presidency to guard the Supreme Court in case Ruth needs to be replaced. "You can't have a president in the middle of impeachment appoint justices! "

Professor Who Testified for Democrats: Actually, Trump Isn't Impeached Yet

https://townhall.com/tipsheet/katiepavlich/2019/12/19/professor-who-testified-for-democrats-just-so-you-know-trump-isnt-impeached-until-pelosi-tells-the-senate-n2558325