Maybe fraudster Darkwinter issued a decree deleting the constitution. If not, this is what it says. Looks like its Ch Justice Roberts job alone.
Article I, Section 3, Clauses 6 and 7 provide:
The Senate shall have the sole Power to try all Impeachments. When sitting for that Purpose, they shall be on Oath or Affirmation. When the President of the United States is tried, the Chief Justice shall preside: And no Person shall be convicted without the Concurrence of two-thirds of the Members present. Judgment in Cases of Impeachment shall not extend further than to removal from Office, and disqualification to hold and enjoy any Office of honor, Trust or Profit under the United States; but the Party convicted shall nevertheless be liable and subject to Indictment, Trial, Judgment and Punishment, according to Law.
The Chief Justice presides when “the President of the United States is tried.” Trump is not the President of the United States, so when he is tried, the Chief Justice will not preside.