McConnell holds all the cards here. He can just do nothing, and blame Pelosi for not even sending over the articles that they rushed through. Or, after giving a warning, he can declare that the Senate will act on the articles as approved anyway, and dismiss them or declare an acquittal.
Thing is...there's not a damn thing Tribe or Pelosi can do to stop him, and his actions cannot be challenged in court.
RE: This is a great example of why Tribe would have been a terrible appointment to the Supreme Court.
We can all be thankful that he is 78 years old and close to retirement. SCOTUS material he is not.