If you ever wondered about the legal arguments that Trump has been making to avoid Congressional oversight and the like, they are mostly absurd, so absurd that they are hard to see as anything else other than obstruction (i.e., frivolous arguments made solely to bog things down in court).
If Trumpettes do nothing else, perhaps read this Order from the federal judge who just struck Trump's lawsuit seeking to prevent the Manhattan DA from getting his tax returns IN CONNECTION WITH AN INVESTIGATION OF HIS ACTIONS AS A CITIZEN (not as president)
Trump argued that a President was immune while in office from all manner of criminal proceeding (the only argument he could make)
Read the judge's response:
https://www.cnn.com/2019/10/07/politics/sdny-ruling-trump-tax-returns/index.html
Just read the introduction, its only a couple pages.
