I'm not certain on how the SC would rule, if a case ever made it there, on impeaching a president Or officer holder after they have vacated the seat.... I know it has been done before....
But in this case with Trump, he was impeached WHILE sitting in office, and not enough time for a trial before leaving office. The constitution says the Senate SHALL try those impeached....
That means the Senate, constitutionally, has to have a trial in the Senate....
Ok, so trump was impeached "while sitting in office", so he is impeached AS president, and we be tried for actions AS president, which means if you are going to hold him accountable AS president, then the trial must be presided by the chief justice.
Unless you are suggesting he was impeached AS president but will be tried as a private citizen...this the reason for allowing a senator to preside.
Either he is going to be tried as president and is required to have the chief justice preside over the trial, or he is a private citizen and cannot be tried by the senate.
If you want to do this, you need to get Robert's on board, and not this wishy washy change the rules to fit their desires stuff.