I am assuming this is the SCOTUS blog you are talking about? If so, this is hardly an authoritative source. Especially when the piece listed on the website is written by just some ho-hum law professor, who is not at all a definitive source on how the letter of the law need be interpreted. The argument that Senate rules trump the constitution is laughable. That could very easily just mean that the Senate could strip you of every right you had, without due process. You accuse me of peddling bullshit, but the letter of the law is clear, the impeachment trial needed Justice Roberts to preside.