There is nothing in the text of the Constitution that supports the notion of absolute presidential immunity. There is no case law to support it, and no favorable legislative history. The practical impacts of it would be devastating. As a result, I think the Supreme Court as a whole will have no problem disposing of this argument; in fact, it may choose not to hear the issue in an attempt to look nonpartisan.
But my analysis does not apply to the two extremely reactionary, partisan justices: Thomas and Alito. What will they say? Will Thomas figure out some way to reconcile the creation of a dictatorship with his supposedly originalist beliefs? Can he somehow scrape up some loose language from, say, Hamilton to justify turning our president into a man on horseback?
We’ll see. Thomas is really hard to embarrass, so I’m guessing he will find a way to support Trump in every issue that comes before him even if it makes him look like a complete hypocrite.