Christopher Roach, an attorney, has published two articles on impeachment during the past two weeks. They're both excellent, clear expositions of the principles behind what's going on. While it's impossible for Roach to offer an entirely dispositive opinion on how Trump and the Senate should proceed--simply because political considerations will inevitably intrude--his discussion is conceptually useful. By presenting a clear conceptual framework and understanding of impeachment under our Constitution, we get a better idea how whatever path is chosen should be framed in order to stand with the principles of our constitutional order.
I won't attempt to summarize each article--while very readable, they're also thorough and need to be digested fully. However, a few remarks ...
The first article, published today, presents the case for simply dismissing the articles of impeachment: Can the Senate Dismiss the Impeachment Without a Trial? It can and it should. Roach's argument is principled and is one with which I'm entirely in agreement--except that I tend to believe that the president would be better served politically by a vote to acquit. Nevertheless, I highly recommend the article in its entirety because Roach presents his case well and, in so doing, also presents a fairly thorough comparison of impeachment trials to ordinary criminal trials. My one reservation is that, while of course it's inevitable that Roach should proceed by way of analogy, I believe that analogizing of the House to a grand jury is insufficient and, in key aspects, misleading. When he gets to the Senate's role he recognizes that such analogies can't be pressed too far.
Here is his conclusion--and bear in mind that his conclusion is based on his previous pretty thorough presentation: