Since Pres. Trump is no longer the President of the United States, Article 1, Section 3's stipulation that the Chief Justice must preside at the trial of a POTUS is no longer applicable.
The presiding officer in impeachment trials for non-presidents (judges, mainly, but apparently now ex-presidents too) is "whoever the Senate picks," and "oldest member of the Senate from the majority party" is pretty standard.
Whether or not Article 1 Section 3's "Chief Justice presides" requirement applies to this impeachment or not has been somewhat in dispute for the past few days -- since he was President when impeached but is no longer at trial -- and apparently it's on the cusp of being settled. (My guess is that Roberts wants to wash his hands of the whole thing and said "please no.")
Since Pres. Trump is no longer the President of the United States, Article 1, Section 3's stipulation that the Chief Justice must preside at the trial of a POTUS is no longer applicable.
The presiding officer in impeachment trials for non-presidents (judges, mainly, but apparently now ex-presidents too) is "whoever the Senate picks," and "oldest member of the Senate from the majority party" is pretty standard.
Whether or not Article 1 Section 3's "Chief Justice presides" requirement applies to this impeachment or not has been somewhat in dispute for the past few days -- since he was President when impeached but is no longer at trial -- and apparently it's on the cusp of being settled. (My guess is that Roberts wants to wash his hands of the whole thing and said "please no.")