If he's to be tried as a holder of public office, it's only logical that Roberts must preside. Because POTUS Trump is on trial, not an ordinary citizen Trump. Even if his term expired.
If he's to be tried as a citizen, the impeachment can't proceed, because only a holder of public office can be impeached.
In practice:
Dems will dress up as clowns, honk around and make their own rules, and if the SCOTUS is called upon, they'll make up some reason to refuse to get involved.
In theory:
If he's to be tried as a holder of public office, it's only logical that Roberts must preside. Because POTUS Trump is on trial, not an ordinary citizen Trump. Even if his term expired.
If he's to be tried as a citizen, the impeachment can't proceed, because only a holder of public office can be impeached.
In practice:
Dems will dress up as clowns, honk around and make their own rules, and if the SCOTUS is called upon, they'll make up some reason to refuse to get involved.
So more Kabuki theater.
GOES BACK TO WATCHING THE MOVIE
Can a foreign government impeach a sitting president (of the Republic) according to constitutional law (pre-1871)?